I had to reinstall our answering machine software recently and had mis-placed the registration key which would unlock features I’d paid for long ago. Features such as being able to record messages longer than 15 seconds. Bleh.
Hoping that the authoring company would help me out, I wrote them asking for the key based on the registration confirmation email I did have.
Instead of helping out an existing customer they decided to try to basically extort more money out of me.