Did you put all 250 on one bet? Did you make any other bets? How did you deposit the funds?
From what I understood is that OP made a deposit via card, placed one bet, withdrew $450 and SB seized all remaining funds.
sportsbet.io successfully approved my documents, but I started playing a few days later.
Can sportsbet confirm that they approved your documents, accepted bet and partially payed you?
You're right. I don't hold balance for many bets because I don't place bets every single second.
Sure they partially paid me because they mention it in their email. If you want I can send you an email confirming my initial kyc (when you upload the documents on the site, after that I received an email thanking me for this)
Welcome to the club dude! Got almost the same problem, after i have won several times sportsbet.io just returned my deposit back and closed the account, no winnings at all