unable to withdraw

Hello, my account number is 6188702. I requested a withdrawal from my account, but the customer service said that your capital must reach 5000 dollars in order to be able to withdraw. I increased my capital to 5100 dollars, but this time they gave another excuse and announced that you should pay 20% tax equal to 1020 dollars. I did not deposit the 20% because I know that if I do, they will not return my money. Taxes and commissions are charged in every transaction. asking for extra money is not correct. I informed them to deduct the tax from my account, but they did not accept. Please help me get my money.