So I've had a similar experience to those listed, had some strange conversation on the phone with a couple of different people. Only verbally agreed to their deal of paying nothing or taking a look at what they sent me. Received an invoice asking for $740 all told over 60 months and listing my "recording number" menacingly. Promptly sent them a reply telling them that I hadn't agreed to any of that and to cancel my account. Furthermore their magazine selection was very poor and probably worse than it looked given that you had to list a 'second choice' for every replacement magazine.
The difference is that I know exactly how they got my information and it disturbs me. When I became a federal employee I had to register a Duns # as a business owner. In fact I am a contractor doing consulting for the government as an individual. Since filing my Duns # over the phone with a Duns employee a very short time ago, I've received two calls from people who referred to me as a "business owner", something no one else in the world would assume based on any other material available about my person.
The first was a retired police magazine (which I didn't really mind) and the second was this company. I am not sure whether the government is selling contact information for business owners, or the Duns corp. is or whether they're just negligently listing it somewhere in public. Either way I am 99.99% certain that this is the means by which these companies have gotten my "business number". They even cited my address as being the one I listed for my Duns # and not the one that I have recently changed my mailing to. Food for thought.