Been seeing mostly mixed opinions on sportsbet.io in the past. Been reading quite a significant amount of negative feedback on it though, so I really personally wouldn't use it.

This dude also ran into a problem with them in the past: https://bitcointalk.org/index.php?topic=3518073.0

Anyway, have you tried contacting their support? They MIGHT be able to help. It wouldn't hurt to try. https://sportsbet.io/support