Like you know this is not a normal situation. The bets were live and the game ended regularly. I can't see why the bets are not released when even the provider has called them "won". In any case I have nothing to do with the provider, I have deposited at your site. You can press them on the situation and honor your duties with your customer.
regards,
How long do you wait after the game was finished? Some sportsbook provider is indeed having some delay to settle bets which the casino doesn’t have control. I encounter some bet that doesn’t settled even after 24hrs on some casino.
Some casino indicates cases like this on their ToS you can review that and use it as reference on your case if you already waited too long for the given time frame in the ToS.