Scam unable to let you withdraw

At first they allow you to withdraw small amount to gain your trust than after I deposit 20k USDT and made a bigger profit they insist that I pay 20% of my profit as investment taxes. After I pay for the investment taxes, two day later they accused my account for illegal arbitrage and demand 30k fees to unfreeze it. Now I reliase that I got scam a total of 25k and there is nothing I can do since the money transfer is in USDT.