I am not going to lie that sounds a bit fishy at best. I am not going to defend the sportsbook at any given day and I always try to support the gambler first but looking at what information we have on our hands it would be understandable why the sportsbook would block your account.

First of all your name is menahem and the account you claim you do not have is called menahem911, secondly that menahem911 account they claim is yours and deny has played on their website and did a double spend and basically hurt the sportsbook, now looking at the situation you sent money there and without waiting played games and after 3 confirmations you tried to withdraw, which in real life could happen but also is a way many double spenders also use just to get away with.

Also, you claim to use VPN which could be the reason for looking suspicious but when you combine the fact that with your exact name someone did a double spending and you tried to withdraw as soon as you won and bet before the confirmation it all comes together for a suspicious defense. I am not saying you are lying but I can safely say it looks suspicious at best.