Im sorry this is happening! Its the worst!

Ive lived in 2 apartments and 2 homes in my adult life.

In my second apartment i was the noisy neighbor and didnt even know it. My step son would rock in his bed to fall asleep when he was really young, and apparently his bed was hitting the wall shared with the neighbor.
They left a nice note on our door. They didnt realise it was a baby and thought it was adult bedroom activities .
My husband went over and had a polite convo with them. Then we moved his bed to the other side of the room.
I could only imagine how annoying we were to them because as a baby he would soothe himself back to sleep throughout the whole night by rocking.

Im glad they came to us first and not the landlord. That wouldve been embarrassing.

But ive always had luck with personal conversations rather than getting anyone else involved. Sorry you arent having the same experience