sportsbet.io definately is a scammers site. At this moment I have the same problems as yours - they had rejected my withdrawal and requested documents to verify me. I think something is very wrong with this sportbook. But it is too late for regrets - they already hold my money
In fact, I think there are a lot of people affected by the actions of sportsbet. But not all of them know about the existence of this forum. I will try to find such people and invite them here.
This is definitely such bad site for sportbook, I admit it that they have really attractive bonus sometime but there is always problem when someone win and get their withdrawal process. They always suspend their money for a period of time before they manage to release it. I do not know why but everyone is complainong this thing