Make the withdrawal more difficult again and again

For the first time, I said that my account will be frozen if I make a mistake, and a deposit of 5,000 US dollars is needed to unfreeze. This will be unfrozen after the remittance is completed.
For the second time, I asked about the membership system and what conditions are needed. The customer service only said that it would be fine to make an appointment. When I said, please make an appointment for me, they will start to pay a deposit of 8,000 US dollars according to the company's regulations, and they can help you. Application, and cannot be cancelled, and threatened that if you don’t complete it, it will damage your personal credibility.
There is also the next third time, really good, with various names, I have already given 18,000 US dollars (this is plus the initial 5,000 US dollars), is it not enough?