I also withdrew BTC on the 11th and they have "disappeared" since. I haven't received any reply from their support since, other than the general message 14 days ago:

"Hello
Please wait
Due DDOS on Bitcoin network there is a delay possible with crediting of transactions madden between 10-11 February. Be patient please"

I see that a few people on this forum finally got their BTC back. What hoops did you guys have to jump through to get this done?