did you get a name? hopefully you got a name. Call the real corperate and Ask for a manager. Give them the phone number that bitch called you from and tell them the whole situation. They should have recording of the phone conversation hopefully. Tell them that someone is calling people as an employee demanding personal information. If they are cool, they will go after this person.
Put the phone number in
http://www.spokeo.com/ and see what comes up. But they could always use one of those pre-paid phones huh