I think the forty-business-day period has already expired. o555355, please tell us: was your deposit eventually credited? And if so, what are you going to do with it now that HTX has come under UK sanctions and its addresses are flagged as dirty in many AML systems?
I think the only way out is to sell USDT for regular money in the exchange's built-in P2P section. If you decide to withdraw it somewhere, you risk running into another block on the receiving side.
The last logged in 7 days after making this post, so it's very likely he got his issue resolved; otherwise, he would have come back to read any possible solutions and replies from members. Think Huobi, now called HTX, sank so low after Justin Sun acquired it. Whatever that guy touches turns into shit, and if it wasn't for USDT, the Tronix blockchain would be long dead by now.
The exchange getting sanctioned by the UK comes as no surprise.