A case i had is xxxxxxxx - a company who asked me for business cards and then claimed they hadn't got them because the delivery address they gave me was wrong.
Strangely they hadn't bothered to contact me and tell me this and kept on ignoring emails from me for a month before coming up with this story when I phoned them.
Anyway I got so peeved I put up a web page to warn other possible suppliers from using them. It'll be interesting what they think of it - if they ever get back to me!
Update - Because my gripe page was designed well, it ranked as high as their own pages and perhaps that's why they got round to paying me and why I removed their name from this blog. Many thanks xxxxxxxx - you know who you are.