Fake e-commerce platform, unable to withdraw funds

The scammer claims to be from Hangzhou, China, works for China Southern Power Grid, and also runs cross-border e-commerce. It is said that after purchasing USDT, recharge into the fake platform, pay the price, and earn the price difference. But when I want to withdraw money, I can't. Either the order is incomplete, or the withdrawal fails, and I must pay a margin.