What was the latest update of this topic? does the OP managed to submit his KYC or did he get his winnings? All gambling site have a reason why they should hold or confiscate the winnings and if they don't give a valid reason then they just destroy their reputation.
This is the last reply from @OP and hopefully, he can withdraw his deposit money even though he can't withdraw his winnings. At least he can get his money back and can use it to gamble in other casinos.
No reason, they just informed me that I can withdraw just my deposit
We also are still determining what happened to @OP now. Maybe he is still negotiating with the casino and can withdraw his winnings. Maybe @OP did KYC to get all the money. Hopefully, no more cases will occur in the casino, and we have learned a valuable lesson from this story.