Is there any specific terms about mistakenly sent deposit on yobit? Maybe something like "you will lose your coin once you sent to wrong address"? I'm not a fan of yobit since there are too many bad reviews, so I do not know about them well.
From what I see on the conversation above, it seems that you'll not get your ETH back. Sorry to say, but it was your own fault and you did it in a bad exchange imho. Just like what others has said, forget it or wait for a miracle that they will process it as what you want.