Oh Lee, I'm a little bit sad by such outcome (you leaving no matter on result of interrogation). You have had some terrible egoistic person against you there and maybe it would be healthier to exclude it from your future.
There are many good points in your words although it might sound dark and negative but I agree completely - there is no justice
Have you thought on writing sort of "confrontation" letter to main people in charge who are responsible for all that madness there? I don't mean to send such letter but to write it for your own good, to acknowledge to self that you have will and power to move on from it and that you don't wanna wish to have anything with such spoiled and "false" system. It could have sort of braking up message as you've already decided to leave.
It could be good for healing from all stress you have got by such process.
Please don't be scared, you are not alone and if I can help you in anyway let me know!!!