Edit: OP, I heard back from them.

Uhh... I will not do the double-blind stuff and instead will go straight to the point and ask for the info I want to know. Please note that this is not me being nosy [that info, suppose you give me, I'll try my best to not to commit it to my memory] nor attacking you. I am simply clarifying to understand better, so I can argue back to the casino.

If you don't mind to share such private information, would you tell me your residency? Uhh, what nationality do you have. By PM is fine if you deemed that info too sensitive to be known by public.