Not near as bad or annoying as your problem but still a pain.
I got the "buy now upgrade" offer but when I tried to subscribe the site refused to accept any form of credit card payment. I duly notified the webmaster who advised that he would pass my report on to the revelent parties. Tried to upgrade several times but no joy. A week later, having heard nothing from the " revelent parties" I tried to subscribe again. Wow success at last but alas without the special offer price.
Its only a trivial amount and I am only having a little moan, I will not abandon LimeWire over this, but it would have been nice if they had made contact.

Hitbit