When I got my house, I needed to set up internet, and Verizon FIOS was what I went for.

I called them to get it set up, and when I suggested the internet dude on the line kept trying to upsell me TV packages. I was polite at first but eventually I said something like "listen, I don't want your 'Movie Lovers' package. I don't want your 'Sports Fan' package. I don't want your 'Family Entertainment' package. I don't want your 'Comedy Lover' package. I just want internet. I do not want anything but internet. If you pitch more more packages I will still only want internet".

Admittedly a little rude, but the guy did get the point after that and he was perfectly helpful getting everything set up.

I'm sure they're forced to do that and graded on how many upgrades they sell. Their bosses will even listen on calls and if they don't make all those pitches, they'll get written up or fired. Source: seen it first-person.