I have had the exact opposite experience - every 12 months I call Comcast when my 1-year introductory offer of internet service for $39.99/month is expiring and ask for it to be re-upped, as opposed to increasing to $64.99/month or whatever, and they do it with no hassling. Heck, this year the dude on the phone voluntarily gave me a better deal of $29.99/month for 12 months.

* not a shill for Comcast, just a happy customer. I tend to be extra-friendly over the phone, which maybe helps, but I have always received stupendous CS support from big corps like Apple, Comcast, Sprint, my CC companies, mortgage holder, and Amazon, to name a few I have dealt with regularly.