I have received sales calls for the past week trying to sell me TV packages. After telling them I'm happy with just the broadband service they kept pushing and asking why. This has happened a couple of times now and if this doesn't stop I will be looking for another broadband provider
I'd recommend registering your phone number(s) with TPS. I used to get quite a few sales calls from Virgin Media (always TV/Broadband, never the Mobile side of things), but since TPS registration I haven't had any.
Never been sure if it actually stops a company from calling it's own customers to sell them stuff, and therefore my lack of them since has been sheer coincidence, but it's worth a try!