Unable to withdraw

Find the customer service on the platform to recharge the US index, and then let the fixed investment of 300,000 return to 30,888, and the cash can be withdrawn after the fixed investment is completed. After the withdrawal, the account did not arrive, and I asked the customer service that it was a delay in the banking system. The third-party platform, the Banking Regulatory Commission, monitored that it was frozen, and half of the account amount had to be paid before the withdrawal was possible. But i think it's a scam