I haven't had that call. But the car warranty scam has recently taken on a new dimension that I hadn't encountered until recently. It's a robot that calls, and it's not even remotely ambiguous. But this latest one used a better robot voice than the previous ones I received, so I laughed and said something about it being a great improvement on the AI. And then it went to an actual recording of a woman laughing and stating it was a real person, before reverting back to the actual robot voice. So naturally, I kept asking it things just to see what it would say. Most questions sent it back through the same exact recording of the fake laugh and reassurance that it was a person. This totally real person that had only 3 or 4 totally not prerecorded robot responses and 1 prerecorded human that wasn't included to help confuse stupid people wanted me to press 1 to speak to someone about extending the warranty on my car.
To be fair, when I call people, I frequently ask them to press 1 if they want to hear more about the super important and very real thing I am calling about. Not just in business, but in life. I find it really shortens my phone calls.
What I'm saying is, I think you should respond to those calls in a similar fashion and try and help those callers get a warranty extension on their vehicle.