It's called phone spoofing. This is mostly done by collection agencies. They pretend to be someone else and getting enough info from you to create an account. Next thing you will get is a paper threat to pay something in full or go to court. Some of us have been dealing with these bottom feeders for months and years. We have programs that track and trace these numbers and then match them to the time and dates with the phone company. None have matched the actual caller. They also spoof themselves as your neighbors. Advice: take your bill or some proof to the phone provider and have them trace. If you owe money or have ever in the past, you can bet places like these will be faking themselves as someone else to get the data they need. Type:"phone spoofing" in your browser or here's a site for a start: http://en.wikipedia.org/wiki/Caller_ID_spoofing . Everyone should be aware of these activities for their own protection. Also see: "predictive dialers" and "VOIP".