This is insane that this casino can randomly reject player by banning his account and seize whole balance.
I admit that this is not fair of them, especially since they do not offer any explanation and do not return your deposit. I would continue to be persistent and try to contact them through social networks, because as far as I can see, what you experienced is not what the reviews of other users show - although it does not necessarily mean that the positive reviews are not fake in some cases.
The amount seized by csgo500 is huge for me that why I'm posing this thread to warn others against this scam service.
If it's an amount you can't afford to lose, why did you invest it in a casino with which you have no previous experience? $100 would seem like a much more logical first time deposit.