I've had a similar bad experience with Comcast contractors. They came to my house in an unmarked pickup truck, wearing baggy jeans and Roc-A-Wear shirts (unprofessional, IMHO). They they proceeded to start drilling a hole through my living room floor to run the cable without checking what their drill was going to hit. I stopped them before they drilled a hole right into my heating duct.
When I tried to get cable at my new place, the cheapest option was $63 a month. I told them to screw off and I've lived without cable since. Honestly I don't miss it. Luckily I can borrow wireless from my neighbors (with their permission!) so I don't have to deal with Comcast at all.