Did not recognize so blocked it.

They call my cell phone about twice a month. Caller states they are from "National Warranty Service calling about your vehicle's warranty, blah blah, blah...."
They've called about 40 times in the past couple years and I keep telling them they have the wrong number, but they just keep calling.

National Warranty Service called again at 4:11 on 5/10/16 about a car I no longer own.  I have told these people several times not to call me, that I don't the vehicle they want to sell me a warranty on, and that I am on the do not call list, yet they continuse to call, and hang up on me when I tell them I longer own the car.