I finally got mad at all these robocalls so I agreed to AC maintenance. A technician showed up so I told him that I just wanted to waste their time like they did me. Owner called me and agreed to take me off their call list. I'm now getting only half as many robocalls than before.
He's got a great idea there Wolfman, that's sure to stop them alright. Just think, that'd be the end of all the junk calls, if the Do Not Call list can't, the laws will. Never hurts to dream.
Too bad no one ever thought of that before. Passing a law against spoofing numbers. Wait, they did: https://www.gpo.gov/fdsys/pkg/PLAW-111publ331/pdf/PLAW-111publ331.pdf
Now if we could only get those dog gone criminals to obey it we would be in good shape.
Why on earth would you redial an unknown number? There are laws but these "people" are crooks and don't give a hang. It sounds like you are new to the game and need to start reading previous reports and the Forum area.