This is a website I came across. A young White IT guy was inundated (as we in South Africa also are) by all these junk sales endlessly. I just switch off my phone and I ignore all sales calls even if they come from organisations I deal with. There are too many scams. Anyway, this guy created a website a few years back, and I see it’s still running. All you do is enter the number that is giving you junk sales calls and this guy’s website will phone them back. It does many things, but it phones them back and overloads them. It does some pretty sophisticated stuff. I think it phones them at an incredible rate – like several times a minute. Basically his website gives them hell and overloads their system and teaches them a lesson.
Here’s the guy’s website: http://isaiddontcall.me/