Catalyst Markets is demanding that I pay a $1,500 "transaction processing fee"

This is Hengda International Financial Trading Platform appthe latest in a series of unexpected charges. When I signed up, there was no mention of any such fees. I’ve already completed all their verification steps, and my account was confirmed. Now they’re telling me I need to pay this fee before I can withdraw. The vague explanation they provided doesn’t make sense, and it seems like they’re just adding random charges to delay my access to funds. Is anyone else experiencing this type of issue?