Another ebay rant -scam by buyer

I sold a used CB radio on eBay that I listed as "non working and for parts only" and the buyer filed a claim against me saying the item was not as described and the radio is junk. He ended up getting a full refund and still got to keep the radio. A year later he tried to bid on another radio from me and I retracted his bid and banned him from bidding on any items of mine.