Yesterday I withdraw 3 times. 3, 5 and 5 BTC. Each withdrawal is processed in just a few seconds.
But I don't know today why it is taking so long to process. More than 6 hours now. But I will still wait before making a deposit again.
Sportsbet is not scamming you so either there is foul play on your end, or something else going on. Did you reach out to support before posting here?