A note on the domain "800notes.com" This web site is hosted with wildwestdomains.com, which is associated with Go Daddy, and located in Phoenix, Arizona. The company that owns 800notes has made their domain information private. It would require some work, but it would be interesting to find out who owns this site. There could be a connection between this site and collection agencies or other companies looking for private information.
They've been calling for over a month - never say who their calling for or what it is except that they are calling on behalf of a debtor - If you have a legitimate debt - you would receive - in writing - in the mail a formal demand for payment. It's United Recovery Systems ~ http://www.unitedrecoverysystems.com/ ~ They are debt collectors