I gave up my landline a two or three years ago because of these calls. I would get ten calls a day from the same place. I blocked every call, but they would call back from a different #. Of course I was on the "Do Not Call" list, but it doesn't do a thing.
I unplugged the phone for a while and occasionally checked voice mails. No one ever called me on that phone anyway. One time I checked it and had a message from my doctor's office, and that's when I cancelled the phone altogether. It was nice not to have it anymore.
I did have to make sure to tell my doctor's office to completely remove that # from my account. My cell phone is through Verizon, and they have a good spam blocker included with my plan. The identified spam #'s don't even come through. The others come through and say something like "likely spam" and I send them to Voice Mail. I don't get many of these.
The Bluebird Carries The Sky On His Back"
-Henry David Thoreau