I had a similar issue on Ebay where a guy slammed me in feedback and never contacted me to see if I would fix or replace the issue.
I finally went to the independent arbitrator, paid them the fee of $20 and gave the guy back 50% of his money to make him happy. All over a scratch on a used Ford Escape headlight lens I sold for my neighbor.
When I asked why he didn't contact me first he said it's not my problem, you didn't log into Ebay for 2 weeks and I don't believe you in the first place because you are scamming me. I had 54 good feedbacks and no bad at the time.
First of all.... He got the light for $40 shipped, anyone wnows how expensive those assy's are knows he got a deal!
Some people are just assholes to be assholes!