Ms Holgate said she is “undoubtedly” most disappointed with Australia Post chair Lucio Di Bartolomeo, who she claims briefed the PM and lied about her resignation.
She said Mr Di Bartolomeo then leaked her offer of resignation to the media without her consent.
“He was the person who briefed the minister. He is the person who spoke to the minister before this event. He’s the person who is supposed to stand up for me. He unlawfully stood me down,” Ms Holgate told Today.
“It’s been the most disgraceful act of bullying. We have contracts, as all employees do. At no point have they ever respected that contract. It is a disgraceful act of humiliation, bullying, intimidation, call it what you like.”