The only thing duelbits can do is send your USDT-TRC20 back to your address because they only have USDT options on ERC20 and BEP20.
But unfortunately, I doubt they will do it to return your deposit because there are many cases like this, and every time you make a deposit there is a warning about what will happen if you make a mistake to the deposit.

Sorry for your loss, it's not a small amount of money and it's hard to accept this loss, but it's a lesson to be more careful, always double-check before pressing the send button.