I work 3rd shift. On my IPhone I go into setting and set up Do Not Disturb during the hours I sleep and choose receive calls from no one. Received 5 calls from 313-209-6202 all while sleeping with the do not disturb on during those hours. That way you don't have to shut off the ringer everyday. Android phones I can't answer for them
I received one call from this home alarm company. They don't like to be called back. Let's say 20 times in one night. I messed with them each time just to waste there time. The longer u keep them on the phone the less money they make. If you plan on doing this....just keep asking them what's the capital Texas, can I speak with a supervisor ( they all say there supervisors). Ask for the floor manager and mess with him. They will block you after 20 calls. Lol
They called the next night and of course I messed with them again. This time I asked if they could repeat the pitch over and over. I would repeat things they said wrong just to piss them off. I called and tried to sell them condoms and if they ever had sex with a farm animal. I was only able to call back 7 times before they blocked me.
If you want them to stop, just mess with them. Have fun with telemarketers they have to stay on the line as long as u don't threaten them. Harass them every chance you get. Have friends, family, co worker mess with them. They will stop if it to much. Ha ha ha ha.