Unable to withdraw. Must pay income tax first

I made a withdrawal on 5/14, and I didn’t get any money until 5/15 the next day. After asking the customer service, the customer service said that my profit exceeded the international standard, so I had to charge 20% profit tax, but I didn’t know what to do. Taxes are collected, and it is said that it is international financial regulations. I also ask the customer service to list the regulations for me to see! But she didn't list it for me! Because there is none at all! Also said that the exchanges are like this! I asked the customer service why the platform didn’t declare how much the excess profit would be subject to tax, and then the customer service said that the regulations of each exchange were different, which was a lie! scam! , I just hope to get the principal back, I have loaned about 10,000 US dollars, please help!