How do they get away with this scam?

http://www.pcmag.com/article2/0,2817,2279347,00.asp

It's supposed to be illegal to make autodialer calls to mobile phones. In addition, it's illegal to call a telephone number with a recording unless you have a prior business relationship with the caller, or else if it's a non-profit or a political candidate. Yet I have received no less than forty recorded messages over the past two months telling me "your warranty is about to expire or has already expired". If I try to ask questions, I get hung up on. If I try to say "put me on your do not call list", I get hung up on. In fact, if I do anything other than roll over and give them my VIN number and personal information, I get hung up on.