This rule obviously impacts the betting markets since the game can never go into overtime since the game will only finish once a team hits the decided target score within the game. For example if you were to bet on draw you would never be able to win in theory.
More importantly, is it possible to bet on a draw at all?
Also, you took the overtime option there in your bet, so you bet on the final end score, and you lost, I don't see any reason for that bet to be returned, even ignoring your claims about now knowing what the rules don't really count.