Like i said, my bad that i didnt issue 2FA on this site before (i have it on every other exchange i have some investments in). And to have your e-mail hacked could be also your own fault. But the system to secure the account in Yobit with situations like that is less than ok. For example Kraken puts your account on lockdown until you have proven everyting is ok again. and even after that keep withdrawal option blocked for a while (my friend had similar case with Kraken as i had with Yobit)
I think there Yobit has nothing with your problem. Your email account is hacked. Yobit is not responsible for the security of your email. After that, you could not prove you were the owner of Yobit account connected to critical email. The same would happen to you with any other exchange without 2FA.
even though I think Yobit it is the worst exchange (plus Etherdelta) they are not guilty here.