Who are these characters, they are calling my number back to back with a caller ID of "Private Name" only. Never have seen this number before. Anyone with some insight on this let us know.

OK. I just found out where this "Private Name comes from, they start out with you verifying your last 4 letters of your last name, which I didn't do, cause I wnted to hear the company name, they repeated the same info again, and at the end they identofy themselves as Duke Energy. My question is, why are they calling with a "Private Name" being they are a utility company? I let my answering service pick up the call and this is what I got. I never answer any cals that are showing Private, Unknown, or any other, unless I see full name and number.