I had a similar situation, I sent the ETC from Binance to the wallet in ETH. KuCoin was very upset, but after a while I found that the address of ETC and ETH are identical !!! I was very happy! Should be so or not, I do not know. But in your situation, the administration was supposed to help you. I regularly use this exchange and can't say anything bad about it.
The address of ETC and ETH are identical on kucoin??
In my kucoin wallet, they are not the same!
It's been 3 weeks that kucoin does not answer me anymore ...
I contacted them by email and on their facebook .... but no sign of life