They will have your name address and of course, your phone number even if unlisted! They say they are Duke Energy and deregulation has required that you receive a 5% discount on your bill. That's as far as my wife got with the call before she said I don't handle the account and for them to call back. Then hung up. Duke Energy doesn't call anyone concerning a deregulation discount. Talked to Duke Customer Service and there is no such thing. Called number back and it does not connect.