HAH! As if on cue, I got another call minutes after I posted in this thread. But ... you gave me an idea. I pressed the button to accept the offer, then there were a couple of questions which were obviously being asked by an automated voice, and then it connected me to an operator ... and I told them that they were talking to someone who did not want to get any more of their phone calls. Remains to be seen whether that worked.
... it doesnt.
I have yelled at them, and called them every name and the calls still continue.