I would personally not use Sportsbet.io for this reason, because they seem to arbitrarily ask for identification.

I've always said that if a service wants identification, they need to make it clear when you deposit, and better yet, ask for your identification before you are allowed to even deposit into your account. From what I've heard sportsbet does neither, and leaves a lot of customers unsatisfied.

While I wouldn't go to the lengths of calling them a scam yet, it is quite clear that they're not to be fully trusted especially with higher amounts, as reflected by their trust score on the forum. Unfortunately the only chance of recourse right now is probably to provide the ID that they require, even though it may not be a great outcome for you, as you essentially have committed to their terms and conditions when you deposited and they'll just cite that.