Didn't they tell you that you are coming from restricted country or didn't you notice that your country is under the restricted list so you keep on playing in this casino?
Sorry to say but I think you will not get any help in this forum since they have no active rep in this forum (last online was on February) so I suggest you to try casinoguru.
Assuming that your case is real, both parties (you and the casino) made a mistake related to the restriction rules unless you previously hide your original IP by VPN and they caught you eventually.
However, as it seems that they have made a decision for you by giving your last deposit back, I think there is nothing you can do more.
Pushing them through 3rd party service wont really help IMO because you are breaking the T&C intentionally or unintentionally.