If you get 1 call then you'll likely get many more. So block them and then you're done. In 1 day I got 7 or 8 calls, some of them just minutes apart. Really, really hate these guys!
The point is they are phishing. If you don't answer they don't leave a message. If you do, they know they have a live number and they know the best time of day to get someone to pick up the phone. Whatever you do, don't pick up. After several "No Answers" they will delete your number. If you pick up they will persist forever.
I have gotten these calls & I subscribe to Atlantic. I am going to drop my subscription, not because I don't like the mag, but because of persistent annoying calls like this.