Hello Op!
Sorry to hear that your big winnings were confiscated. This is life-changing money for a lot of people. I would be disappointed if a casino confiscated my big wins. I think the forum you mentioned in the OP is big, and they should be able to get some response from BK8. Since they did not receive any response, I don't think you will get any response in this forum as well. Especially if they already planned to scam you.

You can check if they are available on Casino Guru and Askgambler. Take your time to create complaint thread there as well. If a casino can steal your money, you have every rights to damage their reputation. I would love to see you get your money as soon as possible.