This happened to me years ago. The wife answered a call from someone posing as At&T with a very convincing line about our bill status. Had to do with by answering the questions we could continue to receive one bill instead of one for local service and one for long distance service.As others have posted, NEVER use the words "YES" or "OKAY" or "RIGHT" or "CORRECT" or any other 'affirmative response' to any unknown entity. Once recorded, it is hard to take back.
We didn't realize our service was changed until we got a letter from AT&T say they were so sorry to lose us as a customer and if we came back we would get an $80 dollar credit. Our service had been "slammed" (changed to a different carrier). When I called the company that we were switched to, they were able to play back a recording of my wife's voice spliced into "And you agree to have your phone service switched to xyz company" Yes.
The practice is illegal, obviously, and we called AT&T to get it fixed. At the time, if that situation happened the other company was required to switch us back for free, and could only charge us what the bill would have been under AT&T. It took some time on the phone to get it all straightened out and not only was I not out any money, I got the $80 dollar credit for switching back.
Just wanted to submit this. So many of the things reported happen to a friend of a friend. This is an actual instance of it happening to me.
Doug in SW IA