For 4 years I have had ATT DSL. When we bought the house we currently live in, I had the service switched. On the day the service switched over, I couldnt get the internet set up and called a tech. The wiring in the house was to old to support DSL and would have had to been upgraded. I declined and called the next day and cancelled as we dont need a home phone, and I ordered internet through Comcast.
The final bill came in (even marked "FINAL BILL" and I paid it, the charges for the tech that came out were on there too. 3 Months later I end up with another bill, so I called them. The CS Rep I spoke with couldnt even find why I was being billed, my account showed as cancelled with the final bill paid, so that was written off. Every so often ATT would tack on an extra $20 or so that wasnt explained in the charge itemization, I would call and they couldnt find where the charge came from and would knock it off. I figure it was just a fishing attempt and could be written off if the customer noticed and explained away as a mistake.