Depends on the region. I usually write (or now have gpt write) a letter with a bunch of fines in it back and that almost always shuts them up. I have never complied with any legal actions against me; I have been to court and that was cheap without a lawyer as well. I did nothing wrong, so I am quite confident I will always win; so far going strong for over 30 years since I am an adult and received such nonsense directed at me or my company.

I would never live in a country (guess US) where you need a kidney to defend yourself even if you did nothing wrong.