I have pressed 9 as suggested to 'stop calls' and yet the calls keep coming twice a week or so. This is the second time I have reported this number. They are selling a "personal medical alert" system. Additionally, pressing 1 to purchase a PMA system terminates the call.
Mrs. Williams, yes they do have plenty of time to waste - the dialing is all automated and done by machines, you are connected to a person only when you answer.
I have hundreds of these numbers and dozens of "#SpamNN" entries in my phone contact list. I start them with # so they sort to the bottom of the list which makes it easier to add a new number to the spammer list.