Just called the customer service number. At first I got someone in technical support who was asking me to give him my phone number & account information. I told him I didn't want to be put on another calling list and asked him to just transfer me to the correct department. Got the right person, they were actually very nice and said that they would put me on the do not call list, but it will take about 3-4 weeks to get the information out to all of the satellite offices. SERIOUSLY! 3-4 Weeks, probably won't even work.
This number calls the spa a couple of times a week. When we answer there is no one there; just a pause. No one says anything and the connection is only broken if we hang up.
I called Century Link. They said to take the phone number and turn it in to the authorities. The calls are not authorized by them and they are not merged with any company who would be calling and asking for our tax id and account information.