Got 2 calls on my cell phone in one day within 2 hours of each other. Got a call from same number at my place of business (direct dial) the next day. Answered it and learned that it was an automated call telling me about the dangers of driving a car that is out of warranty and instructions how I could buy one from them.
These companies do not actually know if your car is under waranty or not. These companies do not even know if you have a car. They get a bulk of numbers and program a computer to call and push their product automatically, If someone bites at the offer good for them, if not well the person is talking to a recording so it doesn't care.