I have used Bitfinex to buy and withdraw IOTA before, I also did a test then sent the rest, all worked out well for me. Just wait for them to answer your support ticket. Also, check the Blockchain or Tangle to find whether your transaction has been sent or went through. Maybe you need to update your IOTA wallet, they recently did an update.
Good to hear. The withdrawal wasn't processed, so I don't think it has been given out yet. I'll check Tangle.
If it has not been processed that is the exchnages problem.