Can I take action against unethical employer?

I'm sorry that you are having problems with your employer, but I don't see anything illegal here. If another employee was harassing you in a way that wasn't sexual harassment, then the employer isn't legally responsible for it. They may have actually done you a favor as it's much easier to get unemployment benefits when you are terminated, then when you resign for good reason. If they try and deny your benefits and claim you were fired "for cause," they will have to prove the policy and that it constituted a severe breach. Otherwise, there really isn't a legal case yet against them, nor will there be.