"His actions screwed me up - but it was the ignorance and the party's reaction that broke me in the end too."

Haworth did not respond to questions. "Given these matters are now subject to appeal the Party won't be making any comment at this time," he said.

Stuff has approached the man, through his lawyer, for comment but has received no response.

Ardern has previously admitted the party did not handle the complaints well.

In August, Haworth promised new rules that would ensure serious allegations would be looked at by an independent expert. The seven complainants were invited to have their cases re-examined and given funding for legal advice.

At her post-Cabinet press briefing on Monday Prime Minister Jacinda Ardern said she was not happy about how her party had handled the allegations.

"I want to make it very clear that I am deeply concerned and incredibly frustrated by the process that has been undertaken by the Labour Party, but also obviously by the nature of the allegations.

"I was informed in the very beginning that the allegations made were not sexual in nature. That is obviously directly counter to what is being reported."

Ardern said the man at the centre of the complaints "has not been on the precinct since the day after these issues arose so I believe for roughly five weeks now and will not be on the precinct at least for the duration of the inquiry that's being undertaken by a QC appointed by the Labour Party."

The prime minister said the QC investigating the matter would report directly to her, and she expected findings within about four weeks.