This is obviously a scammimg call center from Forest City, NC.  I have received 24 calls from 19 different numbers over the last 2 weeks, all ranging between 229-1397 and 229-1437.  They never identify themselves or leave a message.  Sometimes I hear someone saying hello as soon as the answering machine picks up but they hang up when they realize it's a machine.  In the beginning they have tried the same number twice, but they obviously have figured out that I'm blocking them, so now they use a new number each time.  I have reported them to the FTC.