Withdrawals require to pay personal income tax, and the account will be frozen if not paid after 7 days

I have a principal of more than 30,000 and a profit of 14,000. I want to withdraw, but the customer service said that my account principal and income are more than 5000. So I have to pay personal income tax of more than 8,000 before withdrawing. I have doubts in my mind, and ask other friends who know the business. All of them feel that the tax collection is unreasonable. Tried the background operation and can't get the money.