Unable to withdraw. And the most hateful thjing is that they make my account balance from $29,463.43 to be negative, $12,626.39

Hello. I am the victim, Mr. Li. The SAF real account number: 610735 The account opening email is: 1500104999@qq.com I made a deposit of US$1644.00 on the SAF platform in March last year. During the operation period, the market fluctuated greatly. Luckily, I made some money. But the operation of the broker is shocking. They blocked my account. They prevented the transaction and turned the account amount into a negative value. It's really hateful... So I asked to help me get my money back. US$29,463.43..... Looking forward to...