I think it might be Verizon Wireless billing dept. They have a lot of numbers and that area code that says Boston MA on them.I was once on someone's plan, a few years ago, that they cancelled because the monthly bills kept going up and up and not the lower amount they were told when they signed up,,, and I once called them from my home phone to pay my share of the bill (at that time)  The cancelled plan wasn't mine, and the person no longer has a phone, so they harrass me about it (most of the time they don;t leave a message) I'm supposed to find the person and make them pay... If you have Verizon wireless don't ever call them for anything from a landline phone.