I"m so sorry I missed this until now!
You've got Fairwork on the go, I'd also give the Equal Opportunity Commission a call - take notes and use them against your employer.
I will also suggest you never have a meeting with your boss alone. You are well within your rights to postpone any meeting until you have someone arranged to come in with you. That person is allowed to speak either for you or with you and put questions to your boss. It's a fallacy that a witness is not allowed to say anything. The witness can say to you they think the meeting should stop so that you can convene and discuss what's gone down in the conversation to that point.
Nowhere does it say you can get rid of someone because you don't like them. You weren't hired to be a best mate, you're hired for operational reasons and you use your people skills to negotiate and function with the other people around you.
I took an employer to the EOC and got WorkSafe involved because he was discriminating against me - for both being a union delegate, being an older employee and for being the OHS representative. It was a cinema and he'd managed to sack his other staff that were around my age, but he was wary of cutting me out because of the role I had - he took a bit more notice when I wrote him a letter advising him of my election as OHS rep. He'd entertained the election, thinking his young staff were 'playing grown up games', until he got my rather officious letter. The idiot told his young manager not to give me shifts because I cost more, due to being over 18. The clueless manager then told me about that directive, not realising she'd dumped him right in it.
This employer (who only owned the business, he wasn't a manager by title) had a history of shafting people and for being a complete narcissist. He did not take kindly to me taking official avenues and bringing him to the attention of the safety watchdog, let alone the EOC. I had the back up of a union at the time, but I didn't really need them.
I had one of the younger staff members ask me "Why are you fighting this? Why would you want to stay in this job when he doesn't like you?", so I told him that work isn't for being liked, it's not what I was hired for and it was about being civil to people, which I had remained, the whole way through.
I got a small payout, through mediation, but I had to sign confidentiality - which means I just can't mention his name and attach it to the phrase "he's an a-hole"
Go hard, Netix - you've got plenty to go on xxx