Caller: Claimed to be from the Do not call register ?

That number rang me yesterday and a person who claimed to be from the Do Not Call Register said they would stop all my spam calls ?? So I said Thank you ..very much appreciated and hung up. The same number rang again today with the same message but this time wanted to know if I was the owner of my number Once again I thanked the person and hung up. I suspect it is a Spam call.