I had a similar thing happen to me a few weeks ago.
I was in the market for an electronic drum kit. I emailed this guy, he took weeks to reply, was pushy on the phone, and I told him I wasn't interested.
within hours I had an email calling me a welsh twat etc etc. he really was a total arse.
so I posted his email on another forum I frequent and everyone bombarded him with bogus enquiries, and posted the results with much hilarity. he recieved a lot of mail and I'm sure it did his head in.
I suggest we do the same. peurile but amusing