This one correct. Currently I lived in an apartment. Level above me don't know do what, always knock knock knock something. Then level below me come scold me for being noisy. I told them it's level above me that make that knocking sound, they don't believe. From then onwards, when got knocking from above, I use my phone cam and record as proof in case tenant below me come and shoot me again.

I bcome very stress everytime the unit above me keep making the knocking sound.