One of what I do not like about casinos is the disapproval of two or more accounts, although they have their valid reasons, yet, they could hide under that pretence to lock your account. And guess what, this will be legal since it is written in their terms and conditions. However, what pains me is for them not to treat each case independently so that they might know if the person is truly guilty or not, but will rather generalise it since it will nonetheless be to their advantage since they will have money to seize to themselves.

This is not peculiar to your case, it is the general standard that casinos are using, which is why you have to be careful next time. Many casinos would tell you that they allow VPNs, but I tell you, this is a trap, and that is what I believe happened in your causes, you don't have to know the person because VPN IPs could be the same with different customers in different countries. So how do they differentiate when you use a VPN? Some are also victims of dynamic IPs in the same countries because such IPs can clash. But still, casinos do not also want to admit that even though they know there are possibilities.

Well, as it is, you still have a case, continue to mount pressure on them since they've not alleged with proof that the accounts have defrauded them. Your money can still be returned to you if they are fair enough. Good luck to you.