I get the same. Calls all the time but leaves no message. I live in st louis missouri & have never had any bills in Mississippi but the nature of the calls seems sneaky to me. Specifically, never leaving voice mail but more suspicious to me is her voice mail. I have called the number back many times. Her name is lisa randolph but she gives no  further identifying info. like the company she is with, what she does, hours she's available or anything. My husband & I own an electrical contracting business here in missouri & on every voice mail on every line we have, including business & personal, we fully identify ourselves and what we do. Even our billing department is set up to let people know why we r calling. I don't understand the sneakiness, therefor I refuse to speak with her. I  will talk to her only if she identifies herself