Happened to me, slightly different facts as my buyer get refunded by saying the requested a refund that I didn't give. Wasn't true, which I proved, along with all the other documentation that card arrived, was signed for, etc. etc.
Won't make you feel any better, I'm still waiting on resolution of mine. I tried to do it over the phone 2-3 times to no avail. Hoping for the best but prepared for the worst - they already took the money from me so not sure it can get much worse.
Here's my thread. Haven't updated since I don't really have an update, but it should be coming pretty soon.
http://www.net54baseball.com/showthread.php?t=266398