My heart bled for this person I am in the same situation somebody who has no empathy and feels they are entitled, (a good term I will use this in the future) about 20 years ago the flat under us was refurnished for sale, they installed wooden floors, the new owner who lets the place out the Airbnb or similar and does not care, she has received numerous notices form the body corporation and just ignores them while the money tree produces that is all she is concerned with.
I did start proceeding some time ago and some thug was sent to threaten us, after some conversation where I was thinking should I call the police it was agreed that carpets would be put down to help. I thought this is something and should help, and it did to some extent but recently the noise is back I suspect some or all he rugs have been removed.
Doing this was a mistake On hindsight I should have proceeded.