Relax! it's a courtesy call from Verizon..mine was just a reminder that I am past due...which I am (forgot to make a payment last week. They call to try to reach you and if they don't connect they will call back - obviously they don't leave a message. If you answer when they call the first time and make arrangements..they won't keep calling!
I am up to date with payments with version wireless & after talking with them, they still ask to pay the same bill (by creditcard) - No way I'm going to tell them over the phone! Especially when I have the receipt; I think this might be a scam, so please be careful