200 USDT? That is really a huge amount! I think you can`t recover it since we can`t return back the transaction, once you send it assume that it will be delivered to the recepient. Unless otherwise the support and core of the exchange will make a way to recover your funds.

I think this should be a lesson for all that there are separated address in every coin in exchange. You have to be careful in sending your assets because there is no undo in transacting online.