And I guess Bitz.io team isn't going to reverse the decision as they have already paid you more than your deposited funds.
what's the difference between 750$ and 937$? What does it change? they stole 3912$

Have you placed bets on any other platform where the odds provider is same?
I have a lot of bookmakers. Bc.games, betboom, fonbet, wintomato, rollbit. There have never been any problems.