Have to pay a margin when withdraw

At the beginning, someone recommended me to use. After operate for several times, I found that the cash can be withdrawn, but then after participating in the bonus activity, things followed one after another and the withdrawal was rejected. At the end , I was told that someone else deposit 4000 and suspected money laundering and required a margin of 4000USDT. The customer service said that it can be paid in batches. When I paid the 1665USDT and needed to pay the remaining amount, I couldn't contact the customer service anymore. I realized that my money might not be available to withdraw...