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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. Theres no way to provide a solid proof against this accusation besides concluding on the betting behavior alone.
Im not siding with the casino here but the OP is doing something behind for doing such multiple bet on same match.
I explained this detail in my scam accusation topic but i will explain here as well.
Double bets are not an issue. Have in mind that plenty of my bets were single bets as well.
Anyway, Ole7.io is not the one who grades the bets as those are graded from the bookmakers provided via Ole7.io.
Ole7.io are only an intermediary between you and the sportsbooks provided via them. Ole7.io make money by taking commission based on your volume of bets and they are only responsible for your deposits and withdrawals only. This is how the system works with asian style betting brokers. In general, the more volume you make with Ole7.io, the more commission they take from the sportsbooks.
In asia, when you place a bet then the bookie adjust the odds and you are free to bet once again.
Look at my yesterdays bets that i placed with a fair agent:
https://imgur.com/a/bwu64JROf course all bets were graded accordingly. There is nothing wrong with double bets in asia cause this is exactly their business model.
Anyone who bets with asian bookmakers can confirm my words.
No need to say that if they didn't want double bets, they could have easily stopped them from being placed, write it in their ToS etc