You can file a Non-Performing Seller report (sometimes called NPS) with the link uforgot posted above. Ebay is unlikely to do anything though, especially since the seller refunded your PayPal payment.

If you got a neg. feedback and are concerned about it, post a calm straightforward statement in response: "Retaliatory from Non-Performing Seller."

Make a note to avoid that seller's auctions in the future and if you sell, include that ID on your banned bidder list, and then move on.