One thing to think about: No one knows who you are so they buy from the Duopoly as a default. You are using direct mail to get sales, right? Kind of wrong. At first, it is a Branding exercise to get people to recognize that a third party offers telecom too.
The idea of the Bundle Offer - the Irrestible Offer -- is to get people to respond! To start the sales process with you, to get in the funnel!
Start thinking about direct mail as a Red Apple from Red's Apple Ale commercials - you want to knock them in the head; make them notice you, think of you, call you.