Now I am requesting a refund because I asked to be self excluded and they did not grant it now they claim through email that they never received such request from me when I did in fact send them a email + I contacted live chat.
Before we even talk about the reputation of this sportsbook, I think partly you need to take the blame here , because you are very much aware that your account was suppose to be temporarily banned and most likely you would have still called them out to be a scam if you won and they denied your withdraw .
If you ask me this is as good as depositing as huge amount to gamble and when you lose, you choose to chargeback which is dishonesty on the part of the player.
Best way to resolve this is to accept that your lost and can't claim the 20mb.