Unable to withdraw

In March 2023, I was introduced by a friend to trade on this website, and they claimed to be regulated by the US Digital Fraud Enforcement Agency. I made a deposit, and the first withdrawal went smoothly. Then I invested more, but I was unable to withdraw the funds when I made the second withdrawal on March 24. I contacted the customer service, and the customer service told me that I need to pay 20% of the capital gains tax, and it cannot be deducted directly from the account. It needs to be resubmitted to another account designated by the platform, and the designated account can only be used for two hours each time, nad it is not fixed, it should be changed every two hours, otherwise the withdrawal cannot be made. When I contacted the customer service staff, no one responded to the message for a long time. I deposit more than 200,000 US dollars on the platform, and I only want to withdraw 500 US dollars, they asked me to pay more than 11,000 US dollars in capital gains tax. This is clearly a fraud, and I hope the relevant departments can help me.