It is called "mocking" ;your telephone is being used as a mock object. If you call back , a computer string of info is released to thaat "dummy" telephone account number. Just call once and they have the info that they need. I got a call ,too. I reported it to the Fcc, but it this system is also used by the govenment, too. Be careful.
My caller ID revealed only the number; no name was shown. I did not answer the phone. The message was from an electric company offering a discount on my electric bill.