Some 20 or more years ago, I was given a Christmas gift of a Tele-Zapper, a device “as seen on television.” When a robo call comes, it responds with a tone which tells the robo call that my phone number is not active and the robo call then terminates. It works for about 95% of the robo calls that are made to me. Still going strong after all these years. Highly recommended, if you can find one.
I meant what I said and I said what I meant; I’m Horton the elephant, one hundred percent.