How to Say No to Comcast Sales

So, I'm in the process of moving and Comcast is now my service provider for Cable and Internet. I don't know how long it will be that way, because they - like every other cable company - are expensive. But I hate how they are in the practice of trying to push higher, more expensive service levels on people trying to sign up for their service. For those of you looking for advice on how to handle this situation, I suggest something like this:

One day Cable companies will learn that you get people to buy more service by earning their trust right?

Right?