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Brenton Tarrant is appealing against his convictions for murdering 51 worshippers in the Christchurch mosques terror attacks and his life sentence.

A spokesperson for the New Zealand Court of Appeal confirmed to AAP on Tuesday that Tarrant has filed an appeal against his convictions and sentence.

She said no date has been set for a hearing and grounds of appeal were not available.

New Zealand's prime minister accused the mosque gunman, whom she has refused to name since the attacks in March 2019, of re-victimising people.

"His is a story that should not be told and his is a name that should not be repeated and I am going to apply the same rule in commenting on his attempt to re-victimise people," Jacinda Ardern told reporters on Tuesday.

"We should give him nothing."

The Australian man had pleaded guilty to planning and carrying out the massacre and, in a legal first for New Zealand, was sentenced to a lifetime in prison without the possibility of parole.

He was also convicted of 40 charges of attempted murder in his attack on the two mosques, using military-style semi-automatic rifles and filming himself with a head-mounted camera.

A year ago human rights lawyer Tony Ellis wrote in a memo to a coroner that Tarrant told him his guilty pleas were obtained under duress.

He was also allegedly "subject to inhumane or degrading treatment while on remand, which prevented a fair trial".

"He sent me about 15 pages of narrative of how he had been treated since he'd been in prison," Dr Ellis wrote in the memo.

"He said because of how he was treated while he was awaiting trial and afterwards, (that affected) his will to carry on and he decided that the simplest way out was to plead guilty."

Tarrant, who represented himself at his sentencing in August 2020, subsequently disposed of Dr Ellis's services.

The Grafton, NSW, raised man's decision to reverse his earlier pleas and confess his crimes came as a major surprise and meant the matter did not go to trial.

In October last year, chief coroner Deborah Marshall announced there would be a coronial inquiry into the mosque attacks, saying it would allow a "more in-depth investigation into the causes and circumstances of the deaths".

© AAP 2022

A NSW teenager has pleaded guilty to trying to blackmail Optus customers affected by its September data breach.

Dennis Su, 19, texted 93 Optus customers, demanding they transfer $2000 to a CBA bank account "or face their personal information being used for financial crimes".

Su downloaded the personal details from a website that shared breached data, telling police he was having a difficult time being unemployed and wanted to make some "quick money".

No one ever transferred the money, however one person responded with an emoji, according to the agreed facts of the case.

Su then returned to the data-sharing website and gathered more information about the victim to "prove his credibility".

He responded by saying: "The police have your details, and I have nothing you can gain so good luck".

The teenager then deleted all the messages before being arrested on October 6.

Su pleaded guilty to two counts of using equipment connected to a network to commit a serious offence on Tuesday in Downing Centre Local Court.

His lawyers submitted a letter of apology from the teenager as well as character references from two counsellors he's been seeing since the charges were laid.

Su is not alleged to be involved in the Optus hack which exposed the personal details of 10 million Optus customers in a data breach in September, including customers' passport, licence and Medicare numbers.

The Australian Federal Police is running two inquiries into who obtained and attempted to sell the Optus data, and protections for more than 10,000 customers who had their records posted online.

The consumer watchdog has been flooded with Optus-related scam complaints following the data breach.

Su is out on bail and is set to face a sentencing hearing on February 7.

© AAP 2022

Changes to the government's workplace laws overhaul will be put up for debate when federal parliament sits.

Key amendments to the industrial relations bill will be introduced to the House of Representatives, following talks between the government, businesses and unions.

Some have already been flagged, including employers needing a majority of support from employees for a single-interest bargaining authorisation.

But Workplace Relations Minister Tony Burke conceded there will be more to come, particularly after a Senate report comes out on November 17.

Other proposed amendments include businesses and workers not being compelled into single-interest employer agreements, when they have agreed to bargain for a single-enterprise agreement, and companies having 12 months to adjust to changes to fixed-term contracts.

Mr Burke did not accept that the slew of amendments showed the government had rushed the sweeping legislation.

The government wants to pass the laws, which would allow for multi-employer bargaining, by the end of the year, but critical crossbenchers have questioned elements of the bill.

"I don't think we could get to the point where a government listening and acting constructively like that is seen as a weakness," Mr Burke told ABC Radio on Tuesday.

"After a Senate inquiry process, you always end up with amendments ... so I suspect there'll be more to come. If it was the previous government, there'd be times where they just ... refused to accept any amendments, refused to have any consultation."

Independent senator David Pocock said it was good to see the government addressing concerns with the bill, but wanted the supported and co-operative multi-enterprise bargaining streams carved out of the bill.

"I want to get wages moving for as many Australians as possible ... we didn't say we're only going to get wages moving for this person or that person" Mr Burke said.

Independent MP Allegra Spender echoed Senator Pocock's calls to split the bill and pass wage rises for low-paid workers before Christmas.

"(But) the multi-sector employer bargaining, and particularly the piece where it's forced bargaining by businesses that have never been forced into multi-employer bargains before, we should take a really big pause on that and look at the legislation in detail," she told ABC Radio.

Master Builders CEO Denita Wawn said the bill was "highly-rushed".

"There is so much in it that is fundamentally flawed that we think a pause is required to seriously look at it clause by clause," she told the ABC.

ACTU secretary Sally McManus moved to assure small businesses they would not feel any impact of the proposed changes.

"Small business is cut out of the multi-employer bargaining stream ... we have never bargained in small business ... we didn't when we had 60 per cent union membership, we have 14 per cent union membership," she told Channel Nine.

"There is a scare campaign out there by big business because they are the ones that don't want to give people pay rises."

Manager of opposition business Paul Fletcher criticised the government for shutting down a proposal on Monday for a joint committee to examine the legislation.

"It's clear the Albanese government doesn't want Australians knowing that this sweeping industrial relations bill will result in more strikes, unions marching into small businesses and a recipe for chaos in our economy," he said.

© AAP 2022