Knowing their methods will unfortunately not help you. I wish you had found that topic before you deposited any funds to HitBTC. I have read numerous accusations against this exchange even in the ICO days when it was relatively popular and you could trade some of those tokens on their platform. They weren't any better then, and they aren't looking to improve in the future either. I remember that it was always costly to withdraw from (s)HitBTC because of their high withdrawal fees.