I'm with Nachoman as far as hate goes, so I didn't bother with your link. What I can tell you, as an experienced eBayer, is that sometimes you get the s**tty end of the stick. That's life! I've gotten the same treatment from some bike shops. Overall, if I weigh the "deals" vs. the "burns" on eBay, I've still come away with a stinkin' good deal. And the time & effort to try to right the bad situation just isn't worth it in the end. Let it go! Move forward without all that baggage, you'll ultimately be much better off.
AND..., of course, you can always put the bogus item back on eBay & get rid of it, if it causes that much strife.
STRESS RELEIF for buyers remorse? Try climbing your favorite hill 2 gears higher than you've ever used. (don't forget to gripe loud & long at that evil eBayer while you pedal!)
Been there, NOT doin' that again! Dr.D