I pick up to answer the call and it says "That is not a valid extension". Obviously a scam where something broke. Blocked it. Some other reporting sites list it as the usual credit card interest scam.

daily no msg call from a random #

Called, didn't answer, left no message

Called early afternoon, no message. Blocked!

Called my cell, didn't leave a message, I immediately blocked it.

How do these annoyances make money?  Nobody could be this annoying w/o making money from it. (Okay, trolls are that annoying and don't make dollars, unless they're Russians in the pay of the Putin administration, but most trolls are sadly damaged beings and get a warm, powerful feeling of controlling other people and making them react, that's their "pay".)  Are people really so dumb that they fall for these scams?  Our schools should have a course teaching kids not to fall for this. I had a class that taught us about "bait and switch" and other advertising tactics when I was in high school, I found it very useful. Can they not teach an updated version of this class?