Mostly my wife, but myself on occasion, peruse our bills carefully to ensure they don't slip something in we didn't order. I caught Comcast adding a "modem rental fee" for my cable internet. Problem with that is, I have always bought and use my own modems. Never rented one, never will. They tried to say it was a "computer error." No, it was an intentional attempt to chisel more money out of me. They also raised my rates a couple of months ago, with no notice. I called and raised hell, told them that AT&T had fiber to the home here, and they just gave me the final push to switch. They apologized and dropped my former rate by $15 a month, about $25 less than the new rate they tried to slip under the radar. It all adds up over time.