Sometimes when I get a call from an unfamiliar number with my area code (I don’t live there anymore so it’s always a scam spoofing a nearby number) I roleplay as a 911 operator and don’t drop the act until they hang up, threaten them with penalties for wasting public resources and such. It’s probably not strictly legal but they’re calling me illegally too so i think it pretty much evens out :)
Every sale to every individual buyer requires separate handwritten notice, each individually attached to a copy of the privacy policy and the data sold, notarized and sent by certified mail in triplicate, with postage paid by the sender. Make it cost so much that the entire industry becomes obsolete.