I know where you're coming from. I used to be polite to these nuisance callers but after I started getting endless sales calls, I realized I don't have the obligation to be polite to them at all. I've asked them nicely to remove me from their call list but they never did. They invade my privacy...
My dog used to chase off my neighbors cat from our yard, till one day the cat stood its ground, and paw slapped the shit out of my dog, now the cat wonders thru my yard, and my dog don't even care anymore, he's like f that cat. Lol