No one can prove that match is fixed except the official league administration. All of us can have only their own opinion. And the casino decided that it was fixed match. I don`t think that it is fair decision - it is their own opinion too.
At least the casino must return the bet to gambler, but it would be better to pay his prize.
PS. I never heard about casino, who return lost bets in the fixed matches.
How does an official ruling on match fixing make any difference in the payout? There are three suspicious matches every day and the bookmaker can't withhold money for a year on three matches every day waiting for some type of league administration to rule. The investigations may not even start for a month and most don't start. We have to stay in the real world instead of making stuff up on how it should be done. The bookmaker makes the decision since no one has any idea if an investigation will be started. The bookmakers marked the match as suspicious even the ones that paid.