Called up offering an extended warranty for my Hyundai Elantra despite the fact that I had already signed up for the ten year when I bought the car three years ago. I asked them if they were with Hyundai and they said they were in fact Hyundai and Kia. Looking up the number and finding this page I see that this isn't the case since they call for other things. I didn't fall for their crap. Told them I would call Hyundai later because I was at work and didn't have time for this. The woman on the phone promptly hung up on me. The whole thing seemed shady from the start. I have reason to believe they are pure scammers. Judging by the other comments here as well.
My advice to anyone who receives phone calls like this, always double check these type of things directly with your local dealers and not people on the phone who CLAIM to be with the car company of your vehicle.