Called and left no message. When I called back they are some sort of debt collection agency for health care bills. They wanted me to identify myself which I am not about to do by phone and I do not owe anything to any health care provider. I am sure this isn't the only number they use.

This is not the only number they use. As a matter of fact they use a number that shows up on my caller ID as Hotel revshare. I also do not owe anything to any health care provider.