So you are sure that you are not the owner of those accounts indicated in the email?
Is really something suspicious are happening with sportbet.io? I have seen recently there is a couple of accusation are active here and this is another one. If op is not a owner of those accounts then how he prove it(may there is no way to prove it from user end). But sportbet can present the investigation result here to prove op is lying. I know sportsbet is a reputed gambling here but since there are 3 cases are discussing recently, maybe something wrong happening with sportsbet users.
Man, I'm completely sure because I don't have another documents with another name on it. I just think that after the pandemic thing they found a way to cover the losses. I don't know how you can even connect any account to mine, because no one can use my card, no one can use my documents, no one can play from my device. Maybe we got similar IP because I use Megafon router, and mobile IPs are constantly crossing. But this would be very unprofessional.