It is hilton Hotels that keeps calling, but never leaves a message. Called the number back and they give you an option to opt out of the calls by dialing 2. I did and gave the voice on the other end of my phone my number and they said it takes 72 hours. I hope so as I reminded this lady my number was active on the do not call list and I would file a complaint.
This is Hilton and you receive incessant promotional calls after you book a reservation. Call the number back as Cat said and press 2. The first two times I did this, it hung up on me. I had to call back a third time before a person answered. I was told it would take 72 hours to stop receiving the calls. It is an exception to do not call because you purchased from them (I booked a hotel at the NOLA Hilton but the calls are from Orlando). I was also told that once your number is in, you will never receive the calls again even if you stay with them again.