You used your mom's documents to play at BitStarz. I'm not sure how familiar many people are here with casino rules, but I have a feeling that many people here (casino player or not) could see a problem with someone using their mom's passport to play casino online with her identity.
Ok. Let's say this happened, why do you think it's reasonable to keep the dude's money?
Sure, by all means, you should ban him (and probably his mom for good measure) from using your services in the future. But just pocketing his money is outrageously unethical. And please don't act like it's a legal requirement, as you guys appear to operate under a curacao license, which is the same (rubber-stamp) process I went through several years ago back when I used to run a casino -- so I know for a fact there's no legal requirement to pocket people's funds in situations like this (just one to deny service).