There's hundreds of people complaining about similar issues. It seemed like one of the common threads was that Basic Verification stopped working for people who are not US citizens. It's interesting that you had your withdrawal limit increased to that of a Basic account, given the name mismatch error.
How do I go about this? What the heck do I even do now? $770 trashed in the bin I fucking knew it.
I don't understand. Why don't you just trade the USDT markets on Bittrex? I have the Bittrex:ETHUSDT chart open, and it's ticking away normally. Why do you need to involve Changelly or Shapeshift? USDT is always unavailable on Shapeshift, anyway. I've never seen it available once over the months that I've used their service. Not sure about Changelly.
Anyway, 1 USDT = $1.01 at the moment, so no reason to panic. I would be much more concerned about the status of your Bittrex account. The third party enhanced verification service is dodgy. Lots of people with locked accounts right now, unable to verify.
And yeah by the way it's actually weird that my account now results as "Basic", I'm trying to get rid of Bittrex for that reason tho, I would want to avoid getting my account locked.