These pests deliberately call at the most inopportune times, like when you are preparing dinner, or just about to have dinner. Well, I have formulated a procedure to foil them. When they ring, I tell them NOT to hang up. Then I activate my Candy Crush program, press "PLAY" and make sure the sound is switched on and put it on speaker phone. If they call you on land line, just put the mobile next to your land line and tell him NOT to hang up. Just give them back their own medicine. After you do that a couple of times, they won't call back.

This also works for those scammers purporting to be calling from Microsoft. Just tell them to hold on while you switch your imaginary computer on, then let them listen to Candy Crush music.