Yeah. Unfortunately if you use yobit then you just have to prepare to be ignored by support if anything goes wrong.

It's definitely their fault for not sending transaction with enough fees, that caused the network to reject the transaction. They still have the funds as well, but their support is still crap that they can't do anything about it.

Keep on waiting, i've seen people come out with these sort of complaints that gets resolved after months or even a year. Just need to get lucky.