Can't withdraw

I have invested 1500$ in weltrade exchange (https://www.weltrade.com/), according to the floor's invitation about the bonus program: trading bonus is 3015$, deposit bonus is 1500$. I traded and got more than 3500$ profit. At the same time, completing the terms of the bonus program, I withdraw the money. However, after withdrawing more than $3000, the exchange locked the account with the allegation of proof of fake identity registration. This is very unreasonable because as soon as I opened my account, I passed KYC by submitting my identity card and of course approved by weltrade. After that, the floor also asked me to provide other documents such as invoices, portraits holding ID cards ... and all were approved by weltrade floor. I also passed the verification VIDEO call from weltrade via Skype. I absolutely do not violate the things that the exchange stated in the notice. I have sent an email to commit my account, my documents are real and genuine, as well as asking for proof, but have not received a response. Please consider my complaint.