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Is also easy to say "I'm not guilty" from the user/customer side.
The problem is not the money, the problem is the activity that you did. I'm not a sportsbook guy, but I have withdrawn experience for 2-3x time of your money with only around 200-300$ deposit.
And withdraw them without any single problem. So yes, the problem is not the money but what you did it while doing arbitrage betting and they act based on the term and service.
Had already been clarified about arbitration which is totally a violation in terms and conditions of any bookies which is something understandable and trying to pretend that he's innocent and forcing to show bet history? Bookies/platforms won't make out such decision if they haven't seen something
Scam accusation and posting valid reason and proofs neither work or not but on this one then it's already clear as day on what's happening.