PUBG Account Sale Issue - Funds Requested Without Payment Received

I recently sold my PUBG account, but after the sale, I was asked to provide money in order to receive my payment. My account was sold to someone else, yet I have not received any payment. Additionally, my account has now been closed without any explanation.
I am unable to reach anyone for assistance, as live support keeps disconnecting me. Please help me resolve this issue.
This situation is extremely frustrating, and I feel taken advantage of. I expect a prompt resolution, whether that means receiving my payment or having my account reinstated. Thank you.