I have lost 400euro because they used an old chain. They do not update their wallets.
Anyone who's reading this should take heed and avoid Yobit like the plague. Their customer service is essentially non-existant, and a lot of people have scam accusations open against them. I used to use them to trade occasionally, but I stopped a long time ago after reading all of those accusations on bitcointalk.
For an exchange to pick a coin to pump and dump and then go ahead and do it is absolutely unethical, and I wouldn't trust any exchange that did this to execute legitimate orders properly. Who's to say that they wouldn't give fake price or volume data or be guilty of some other breach of ethics? That should scare away any person with a brain.
Russians just do what they want, that is their culture.
This is the theme of Yobit (great song by the way)
https://www.youtube.com/watch?v=U06jlgpMtQs
I've received the message as well, not particularly inviting and that is an understatement.