Refund issues

Hi, I bought a product from a seller and needed a refund when I got overcharged. It showed on my account that he had made the refund but it was "unclaimed."

When I tried to get the money claimed, a customer agent told me I had to wait 20 days because of the dispute I had opened. I tried getting in touch again before the 20 days were over but my messages in the Message Centre didn't want to go through when I tried replying to agents.

Now the money shows that it's "denied." I've emailed the seller as per advice from another agent to try and ask him to resend the money but he isn't answering.

I tried calling PayPal's call centre and was kept on hold until I ran out of airtime. I don't know what to do, can someone please assist me.