Call repeatedly, leaving no message. When I used *69 I was told "All our agents are busy" and "Please punch in your nine-digit Social Security number".
This number has been calling me a few times a day. I called it back and the automated message that answers says: "Thank you for calling Regional Media Group, all of our operators are busy, please leave a message."
339-337-5675 calls 3-4 times a day about every 3 days. I have finally got a human and asked them nicly to stop calling. A 3rd party calls you then transfers the info to a company trying to sell you a home security system.