Some sort of scam.  First, when I answered, there was a recording about some sort of business oppertunity. I am on the National Do Not Call List, so I was wondering why they would call me. When I called the number back to ask them to remove me, I got a recording directing me to a 800 number for billing inquiries. When I called that number, they claim to have no idea what I was talking about... SCAM!!!