> Same if you get junk mail in your mailbox that prominently displays a sign “NO JUNK MAIL”. Call them. Ask to speak to the person who put illegal advertising in your mailbox. When they blame it on the deliverer, say “Do you realise you are legally responsible for any illegal action you pay someone else to perform?”

Asking barbed, rhetorical questions to a stranger over the phone isn't "being assertive", especially when the person you're speaking to most likely has little to no control over the thing you are complaining about.

To quote The Big Lebowski: "You're not wrong, Walter. You're just an asshole!"