Good point, but in these scenarios you are free to just hang up. Most people I think are afraid of offending someone but if they are being assholes (salesman/scammers) you have no obligation to be nice or continue the conversation. I find it empowering, even cathartic to say something like, “Oh, you’re one of those pieces of shit scammers I’ve heard about. Good day, piece of shit” or simply, “I don’t have time for your bs” and hang up.