I feel your pain and frustration.
Try to calm down, thats best advise I can give you. I have had similar experience with another casino and I never got paid, it was almost 80k USD.
I also was very nervous and that fuckd up my head a bit.
When I made decision to let go, was the best decision of my life, which I know will be hard for you.
If I understood the thread, casino has made final decision, unfortunantly it means what it stands for.
God bless you and I hope you will get over this.