Daveshoe- We had the exact thing with MCI-they are relentless. Would not stop @ 3-4 times a day. I started out polite-asked to be removed from the list-it only worsened.
Then we had a medical issue with our daughter, and we were waiting for the doctor(s) to call. . several times with results from different tests over a long period.
Yeah-we have call waiting-but they just didnt get the idea of nervous parents waiting for "The Call". And really-if we were on a important call, and switched over thinking it was a doctor-well, you can imagine how I let the expletives fly.
I went for answering the phone "Hello. . Suicide Hotline". . and letting the conversation run its course as "counselor"-finally suggesting they do us all a favor.
I do believe in telmarketers following the 3 basics for a polite conversation. Speak PROPER english, no delay when I pickup, and has never called before.