Sportsbet.io is a SCAM. They selectively scam people.I made a deposit of 0.002 BTC using mycellium wallet and this mycellium wallet sent the btc with 0.01$ fees and i was in a hurry i did not notice this but my sportsbet.io account was instantly credited without any confirmation.(
they intentionally don't have 1 confirmation requirement on deposit and crediting so that they can later mention that user tried to double spend if by mistake a low fee tx is sent and is not confirmed).
I placed the bet and won it still my deposit wasn't confirmed. Meanwhile i was trying every bitcoin tx accelerator to push the tx but it didn't worked but after my bet settled my deposit tx got confirmed. I tried to withdraw 0.0034 BTC and was told 'Withdraw denied. contact support'. I contact the support and they said to submit KYC. Seriously? KYC for withdrawing 0.0034 BTC ? I'm glad i did not made a big deposit in this site. Now they have disabled withdrawls in my account and demand KYC. I'm not stupid to do KYC if i was doing sports betting and for what 0.0034 BTC?
Keep it scammers.

Yes there are not many brands that are perfect in the world. But sportsbet is one of those in the minority. I think you should send an e-mail to support. I'm sure they'il embarrass you, and if you're right, they'il do what's necessary. Don't be angry, just focus how can you solve.