Earlier quoted context omitted.
I guess some of us are old enough that wrong numbers were a thing and it was just polite to let them know. Especially when it sounds legit
Wrong numbers generally used to be caused by misdialing. Nobody dials numbers any more.
Calling a business though? A colleague had a problem where their number was 1 digit off from some delivery number (maybe pizza?) and got calls all the time.
Someone else erroneously has their number (different area code) in the google info for another business, same problem and took a while to fix.