Only the exchange team have access to that address's private key, anyone telling you that they will help is deceiving you, do not send money to anyone because it's impossible to get your asset back, only the exchange team can help you.
I guess you are right, I somehow need to persuade the KuCoin team to take on my case. I am willing to pay all of their efforts, I already offered them the 1000 USD as well.
But all I receive are standard replies, regardless of what I write to them.