We should know the risk of using VPN, it's only acceptable if you use it for privacy but if you are using it to bypass some restriction, then you have to pay the price and you have no right to complain as in the first place you know yourself have violated the TOS.
It is unfortunate to know that OP has to go through such situations and it is also a shame to loss that much amount as well. But I would have to agree that these circumstances are consequences of OP’s actions and decisions to bypass the restrictions set on his region, and more so of his intention to get away when detected an opted to do another trick. I think that the casino has a huge fight if they push through in blocking the account.