Unable to withdraw. Require to pay margin

There are several successful withdrawals before. The last large withdrawal failed. I asked customer service, but was told that I couldn’t withdraw it without the platform’s notarization and certification, and asked to pay the self-certification fee! After the payment, they also demanded a security deposit and provided supporting documents on the grounds of making false reports on fair information! It is impossible to withdraw cash so far, but the mining machine income is operating normally daily! Hope there are no more victims!