Ekada capital don't allow Investor to withdraw

I top-up money to EKADA CAPITAL FX (www.ekadafx.com) and traded via their trading platform (https://webtrader.tradinghub.app/), When I want to withdraw money, they don't allow me to withdraw money by the reason "Dear customers, hello! Your tax payment has been successfully submitted. According to the feedback from the risk control department, your account involves other people's deposits, money laundering and other illegal activities, and the account has been blocked. You need to pay 10% of the deposit in this account (USD ...* 10% = USD ...), which will only be kept in your wallet account as a verification of the safety of funds. Please complete the payment within 24 hours so that your account can be unfrozen and withdrawn". When I asked why my account was related to money laundering and other illegal activities, they just quote a notice from CBRC (China Banking Regulatory Commission) and required me to pay the deposit, no more explanation.