Normally people complain about bad customer service, so I think I should compliment Comcast for the reverse. I've been having problems with my cable service throwing a service-disruption error. I've done all of the troubleshooting I read online for the particular error, and nothing made the error go away. Today I called Comcast and expected them to have me do everything I'd already done, but to my surprise, they believed me when I said I'd done those things, including trying a different cable connection to the wall outlet. They concluded that the most likely problem was a defective converter box, and that I should just take the box to the nearest office an exchange it. I pulled myself together sufficiently to do that and drove over to the nearest office. The wait wasn't too long. The people at the counter were very friendly and helpful and did the exchange with a minimum of hassle. I'd brought a copy of my bill and my ID and other documents to prove that I was who I said I was, but they said all they needed was the serial number on the unit. I took the new unit home, plugged it in, turned it on, called the activation number, and after about 15 minutes I had working cable again. I hope that's that.
Given the circumstances, I don't see how it could have been much less painless than that.