I had been using Bittrex for a couple of months, but I never encounter like yours. In fact, its been so many times that I withdraw in bittrex more than 0.1BTC just every time I used bittrex platform most often sent me a confirmation in my email account to confirm my withdrawal then that's it. Its done,
![Smiley](https://bitcointalk.org/Smileys/default/smiley.gif)
Bittrex is also my official trading and exchange site and I have never experienced the bad experience of OP above. So far, I find Bittrex to be the most newbie-friendly trading site and it is fast in withdrawing my coins. The only thing I am wary about Bittrex is that it is USA-based and we know how USA authorities can act in case it can sense that something is wrong. I am just hoping that Bittrex is really doing everything it can to make sure that they are always above board.