Hi Pham,
Thanks for reaching out.
You have sent USDT to your BTC address. Sending USDT to a BTC address means that the coins are not compatible, thus the transaction was not successful.
Poloniex does not offer a token/coin recovery service because the process to recover tokens is extremely complicated and may result in significant cost, time, and risk. To avoid this situation in the future, please take extra caution when depositing funds to make sure the coins match the wallet you are depositing to.
If you have any other questions about your account, let us know and we will be happy to help!
Best,
Poloniex Support Team
I am very sad when I receive a letter from poloniex .
Sorry to hear that you lost your USDT, it's depends on exchange their decisions, look like poloniex won't support the process of recover tokens, I'm confused that USDT and BTC address is same format, if not why it's still able to make the transaction? Anyway, actually poloniex their reputation is not good in past few years, it's not my favourite cryptocurrency exchange, just be careful next time and double check everything.