Here are my thoughts why companies play these games.
All companies play games, or accidentally change your service and so on. To this day I think these types of things are done on purpose so they can try to sell you something else. As every time I call customer service to have a problem fixed they always try to sell me something else after wards.
Comcast does this immediately , i called support about cablecard issues, and the 'operator' wanted to sell me something, before fixing my issue. I immediately said to her, "do you want me to cancel service?". I was passed on to support right after that ?