Such a lengthy post that can be described by short sentence. The answer to your concern was the casino accused the user for doing an arbitrage or fixed match bet due to his betting behavior which I understand too because normal player will only bet once on same match. There’s no way to provide a solid proof against this accusation besides concluding on the betting behavior alone.

I’m not siding with the casino here but the OP is doing something behind for doing such multiple bet on same match.