Earlier quoted context omitted.
> This is such an interesting essential part of scams. I guess it's a part of human nature. Absolutely. It happened to my relatives too. The way I found out was I was there visiting and they got a call which I picked it up. It came from what sounded like an Indian person. You see, they wanted to "refund the money" and just needed the bank account details. Aha! I thought, I'll play dumb and pretended to mistype their…
> Teach them how do respond and how to handle these scammers. Concretely, the way to respond is this: If you ever get a call that claims to be from business X, tell them "OK, I'll call you back." Then get off the phone, look up the number for X yourself , and call them. If it was really X calling you, you'll get back to where you need to be. If it was a scam, X will tell you they don't know what you're talking about.…
Good example would be someone claiming to be your ISP apologizing for recent slow internet speeds (when doesn't this happen), and wanting to confirm you're now happy and not experiencing slow speeds. Why would you doubt this and go to the trouble of calling back?
The other problem is businesses being so extremely dumb. I've had and heard of man cases of Banks calling people, asking them verification questions on cold calls and offering no way to call them back. Not just stupid in that it limits your strategy, but it actually trains people to be more vulnerable to scammers.