I think A would be the most effective, along with sending an email to the vender, alerting them to the post(after you've already gotten a heated debate, of course). If the vender doesn't participate in the thread within a reasonable time(I'd say about 48 hours), just download some windoze anon. email programs, some of them have an option that you can send hundreds of emails to the person. If 1 email didn't do the trick, this always works

I don't really know if that is an option on windoze, I'm a mac-user, so if anyine has this problem, IM me, then I can email you the program that I created, which is much faster then the commercial ones(2 emails a second-try leaving THAT on for an hour).