I know you’re trying to help, but this is a clear case of thievery by BC Games. If they had concerns about the OP's KYC, a simple video call with the OP would have resolved that. They suspect abuse, they have the OP’s details and address from their documents, and have not reported it to the police, but they've happily decided to keep the money for themselves. Let's not pretend this is something else; it's a clear case of theft and it's shady as hell.
To be honest, I wouldn't be so quick to prejudge until you know all the details from BC.Game. Payouts of this magnitude are certainly not uncommon at BC.Game, so I doubt that they are withholding the payout for no reason.
Of course, the case can only be cleared up if the relevant documents (videos from the KYC, etc.) are presented. As the support team has also actively contributed to this thread, I am sure that they are actively working on the issue, as a casino is unlikely to put up with accusations regarding its reputation.