Seems like a very complicated case that might require an experienced and trustworthy arbitrator. As just a forum member, it's hard to know as of now who could be right or wrong.
Have you considered raising this complaint on a platform like Askgamblers or casinoguru? If you do, please share a link here to keep as posted on how the case gets resolved.
I discovered you have already notified them on their Official ANN.
Its really not that complex. They offer casino for customers to play, I played and won, they stole my money. I offered full bet history to show my style of play for everyone to verify and agree or disagree whether i did something nefarious.
When things like this happens, it's very difficult to judge on where the fault is, you're only telling olus your own part of the story, am sure they would have something to say as well if asked , but can you share with us the reason they give for an excuse for doing this on you, am sure they cannot just denied you without giving a reason for that, have you now considered talking to them through any of their contacts on that same issue, what was the response you've received, I believe well you made a research about them before using them as your preferred gambling platform and trusted them to that extent before now.