Can’t withdraw fund from Ryder Exchange :

I met "赵思佳" on Facebook, She recommended Ryder Exchange，I deposited 1700 USDT then successfully withdrew 500 USDT; I deposited 15000 USDT then successfully withdrew 1300 USDT.When my total assets were 50000 USDT and successfully withdrew 3200 USDT . When my total assets were 80000 USDT and failed to withdraw 32000 USDT.after I successfully completed advanced certification, I failed to withdraw 900 USDT and then no permission to withdraw.