I'm currently using bittrex and this is alarming. Though I haven't experience this and I do not want this ever to happen to me. Maybe OP shouldn't have tried to do enhanced verification again since he has already done it the first time, maybe it is the reason why your account was frozen. I wish you recover your very account soon.
That's exactly what happened. In hindsight the site was acting buggy and I shouldn't have done it again, but I needed to move funds to Binance to buy something I felt was going to moon soon (and it did).
However, getting locked up for almost 7 days now with no end in sight is terrible.
Imagine not being able to trade (buy/sell) or withdraw any of your money. It is just frozen. Imagine seeing your holding of BTC/NEO/whatever drop and not being able to do anything about it. Imagine seeing a good technical indicator and knowing something is going to moon and not being able to buy it.