Has the tech team come up with any response to your tickets? Or have they just flat out ignored you?

Not surprising though if they did, since this is literally how yobit is operating right now.

They're obviously using the excuse here that you are the one that made the mistake. While I understand that retrieving ETH from an ETC wallet is a long process, it is doable by most exchanges and definitely have been practically done before. Especially when you offered to pay a cut of that sum to Yobit, there is no excuse for not attending to this matter, but instead, go completely without a response for nearly a year.

Hopefully you now know how bad of an exchange yobit is. Anything could go wrong with them, and there are virtually no benefits of using them. Avoid in the future and take this as a lesson.

Ethereum and Ethereum Classic are two different coins.
You can't send money from Ethereum to Ethereum Classic addresses.
Please deposit ETH and ETC to correct addresses. Yobit will not cross-chain credit your account.
Yobit generates a separate Ethereum and Ethereum Classic deposit addresses because of security requirements.
Info: What is the replay attack? http://vessenes.com/do-not-mess-with-eth-classic-it-will-f-you-up/