I believe these calls are data mining. They always want me to confirm information that they already have. When they are finished with "20 questions" they want me to tell them the year I was born, favorite color, dogs name, mothers maiden name, city I was born, etc. They always say that this last question is to "verify that I talked to them".
Months later they call back and ask the same 20 questions but ask a different "verify" question. Over a period of time they collect more information than you think you have given. The magazines I subscribe to must be selling my contact info.
Same pattern Calls in AM EST - never leaves voice message. Is there a way to block this number on a cell phone? Send it to junk mail folder like email?