Brotherston complained about the manager to a female member of TVNZ's HR department but was laughed away after they said no one would believe her.
Both the senior manager and the HR department member no longer work for TVNZ, 1 News reported this evening.
TVNZ chief executive Kevin Kenrick said the company is open to hearing from anyone who has experienced similar incidents.
"We think that there is an opportunity to learn from that and where appropriate to apologise for behaviour that was unacceptable," he said.
Yesterday, a TVNZ spokeswoman told the Herald the company was "saddened" to hear about the harassment behaviour back in 2010.
"This is a matter we take very seriously," the spokeswoman said.
"We have zero tolerance for any form of harassment in our workplace and we're committed to providing a working environment that is inclusive and respectful."
"We will follow up directly with Andi to better understand what happened so we can learn from this and ensure it doesn't happen again."