In my "real" self, I would personally tell this person to %@!^% off! However, I sell on ebay as well...and as much as my tongue bleeds at times I have to keep in mind that they are in fact a customer. I know it's technically an auction site, but let's be honest, we as sellers are trying to make money, and therefore are a business...albeit a small one, but one nonetheless. If we bought a part at (enter preferred auto parts store here) and it was the wrong part due to our error, we would try to return it with a receipt. So in short LOL, I would accept the return--with them paying return postage--and repost it, and then dumb it down unfortunately. I feel ya man!