How long has the yobit wallet been down?
I seen cheap coins there and bought with out thinking to check if there was a reason.
I'm complaining about shitty Yobit for weeks now. Opened support tickets, tried the trollbox, wrote in their thread here - no reaction. VTC wallet is offline at least since February. And I've coins stuck in my deposit address, so I can't neither sell nor withdraw them.
If you lost coins because of this, please leave a negative trust rating for them (go to
https://bitcointalk.org/index.php?topic=914975.0 Click on the Trust link for the yobit user).