My strategies with Phone Scammers:

Scammer: I'm calling about your electricity bill...

Me: Sorry, but we don't use electricity... (hangs up)

Next Scammer: I'm calling about your water bill...

Me: Sorry, but we don't drink water... (hangs up)

Next Scammer: This is Telstra calling about your Phone Bill..

Me (my favourite): Sorry, but we don't have a phone... (hangs up)

@JohnJamesOZ I always answer with "Australian Federal Police..." in a really stern voice and see where they go from there
@JohnJamesOZ My strategy for solar scammers - I own a solar company 🤣
@JohnJamesOZ My childhood neighbors, living in New York City, got in a similar thing. Then about 70% of the neighborhood heated homes with gas during the winter, 25% with oil furnaces, most of the rest with electricity (risky, because blizzards were a risk for blackouts). Someone trying to sell gas furnaces called, and he was able to tell them he heated with wood. That definitely flustered the caller