They banned my account immediately after sending my deposit back, so they forfeited all of my winnings under false pretences.
Ok. Thanks for the explanation. I was confused because the way you wrote it on the OP, it looks like they banned your account without proceeding with the withdrawal. In such a case, I would say this is not the only complaint we have seen. Not only rakebit, none of the casinos actually reveal what rules you violated for privacy reasons. Because if they are public it, other players will use the same method to take advantage.
But if you contact the mediators like casino.guru, they may provide some documents to them to show what rules you violated. If you know already, you know it. But if you don't know, go open a case against them.