I think you made a mistake regarding this if you are on a binance network the reciever should be in bep20 network also
if you are in an erc20 network or what we call ethereum network  you should select erc20/eth network, or else it will not be received and lost

best way is to contact them, i have a friend who deposit with the wrong network and the exchange return the money, but it takes like almost a month,
the event happen in binance, so i don't know if kucoin will help you with that,
Note: it is important to look and double check what network you are using and make sure the receiving end is the same.