Hello, I see you're facing a very difficult situation. The best thing you can do is give the complaint mediator all the details, as a casino explanation may be needed to assess the overall fairness.
Still, I would like to emphasize that it's advised to read the rules related to wagering requirements associated with deposits. 20x wagering is insane but if it is clearly stated in the rules, anyone can walk away without even making a deposit. I don't mean to patronize, but considering it through and through, your experience paints the casino as a poor place to play and sometimes the rules offer few direct clues.
Hopefully, it will all be sorted out soon!
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