I Had the same problem and I replied to it - if you go to the feedback section it has the option to resopnd or follow up - not sure of the difference. i responded. On mine it was an auction for coupons and it ended like 2 weeks ago - the coupons were good til 6/30/06 and they guy just didn't pay me for almost a week, so I had to send him a reminder email and then he finally pays and then when they came in the mail he complained cause they expired 3 days later. he actually lied and said they expired the day he received or day after he received them - as he posted feedback on 6/27 - this made no sense. The auction said the exp date, so my response just said the facts - short and to the point - "Auction clearly stated exp date of 6/30 and you posted this 6/27"
That showed that the buyer was being stupid and lying and that I was honest and upfront.

HTH
Rae