These people are (foreign... Pakistani?) contractors for an American company that makes many different Business-to-Business magazines. The subscriptions are free to anybody who works in the applicable industry, and the magazines are completely funded by advertising.
These people call you when the year is up (to get you to re-subscribe) or when you send an unsubscribe request. Their MajicJack phone numbers constantly change, probably by design.
The thing is, these contractors SUCK. They robocall and almost always hang up because a live operator isn't ready, but even if one is, these guys don't listen to you unless you say what they want to hear. I have been trying to stop getting these magazines for several years now, by both sending in requests to unsubscribe and by asking to cancel when these people call, but they NEVER RESPECT UNSUBSCRIBE REQUESTS.
They either argue with you until you agree to continue your subscription (saying things like "but it is free!" over and over) or just say your subscription has been cancelled, but the magazines just keep coming.
If somebody were really inclined to do something about this, contact the advertisers of the magazine(s) you get and tell them how you throw the magazine out without so much as reading the cover every month. Tell them that they artificially bolster their subscriber numbers by not allowing people to unsubscribe. You won't have any luck talking to the folks that call, I have been doing that since at least 2008 and I still have industry-related magazines coming to my door every month for industries I am no longer working in. They go straight into the trash... it is such a waste.