I did the same mistake on yobit. ,I tried to send my ETH from poloneix to my yobit ETC adress by mistake.  I asked both yobit admin with the nickname dominikherzog and support desk.
he replied as "Yobit generates a separate Ethereum and Ethereum Classic deposit addresses because of security requirements." without creating a solution. But on etherscan website I check my ETC wallet. On my ETC wallet there are 19 ETH is shown. So the transaction is verified. I can refund ETHs with ETC private key of yobit.
but they refuse to give it. And could not understand why?. I am following my ETHs on  etherscan. If I detect a transfer out of my control , I dont know what to do ? I hope they wont steal my ETHS.

dominikherzog previously help CryptoManiacHen, he does'nt want to help.