When 37 Signals shows up on a bill, there's a phone number. That phone number is a pre-recorded message that explains the charges and about how to contact them. I'm thinking about setting up something similar, and I'd really like to listen to their recording!
Does anyone know the number?
The article I found out about their pre-recorded message: http://37signals.com/svn/posts/1545-how-we-reduced-chargebacks-by-30-as-a-percentage-of-sales