I received a very garbled voice message from very noisy location. I called the number back from a different phone and they knew immediately what my first and last name were. 

The operator identified the company as : XXXX XXXX XXXX. And explained they needed personal information to identify me before they would discuss anything. 

I began by requesting the street address and company telephone number. The operator would not give me the address or number. The operator said " they have offices all over the world '' as if this should appease me. I explained they are required by law to provide this info. I asked to speak with the supervisor. The operator put me on hold XXXX seconds, then said the supervisor was unavailable and abruptly disconnected me. 

When I called back, the " supervisor '' picked up. He gave me the same runaround. They will not discuss anything unless I divulge personal information. 

I told the supervisor this is a case of fraud ( taking a wild guess : because I have a long history of trying to resolve a fraudulent debt, and new collection agencies keep calling well past the statue of limitations on unsecured debt ). I asked to speak to his fraud department. The supervisor stated they do not have a fraud department, nor do they process claims of fraud. 

At this point I decided to deal with this " company '' as an illegitimate operation.