It seems like they are trying to force everyone to use the ticket system. I searched around and couldn't find a support email address. I checked and couldn't find anything useful in my email either. I think the "mailer" account they send emails from is a no-reply address. It's probably a dead-end.

They are notoriously bad with customer support, so I don't have the highest hopes for a good resolution here. 0.5 LTC? It could be worse, I suppose. It's customary to open another account in order to open a support ticket. That's what I would suggest. They didn't send any explanation of the account disablement to your email? I haven't heard of this happening much on Yobit. I hope it's not the start of a new trend.