The reason it is so unpleasant to deal with Comcast is that [ call center staff are under pressure to sell something ]( http://www.theverge.com/2014/8/19/6028059/training-materials-show-how-comcast-pushes-customer-service-reps-to ) , regardless of the purpose of the call.
Ссылка: https://stallman.org/archives/2014-may-aug.html#25_August_2014_%28Unpleasantness_of_Comcast%29