Post the txid and I'll get it confirmed for you. In the future, use bitcoinfees.earn.com to check what fee you need for a fast confirmation. This is unrelated to Bittrex.
I just realized that 21.com changed their domain name to earn.com. I though what you linked was a copy of 21.com's bitcoin transaction fee calculator. Good to know though.
But yeah, what happened to OP was not related to Bittrex, it was because of the fees. Since I think bittrex requires 3 confirmations and seems like OP's tx has not even had 1.