The thing is that he was using VPN and it is clearly mentioned on the ToS that using VPN for restricted regions is prohibited.
So the user should have been aware of that before depositing such large sum of money on the site.
I wonder how people deposit such large amount on casino sites without reading their Terms and Conditions.
If BC.GAME is at mercy only then the user might get back his funds and otherwise they are pretty much gone.
Try to bypass VPN prohibition and fund the account with big deposit, that is a very bad combination of actions. The user actually ignored many basic risk control steps by doing all those things and eventually had no reason to complain about all things he did that are all not accepted by BC.Game's ToS.
If the user did not bet and win big or abuse the casinos by any hole of games or platform he found, BC.Game can refund his deposit or refund all money left in that account to the user. It's best they can generously do if they want but the user has no right to ask for it if he did other unacceptable activities like abuse in the casino's marketing programs or exploits their games.