Good afternoon to the Manager of this building:
I am writing to you as a resident of your building on the eighth-floor room 823 that my neighbour's behaviour have been disturbing. Disturbing as in the sense that they play loud music late at night to the early hours. They have never responded to my complaints and just stare at me when I talk to them about them. I think this would require a perhaps upper authority like you to speak to them to help them understand the certain conditions they must adapt to when living together in a building.
Thank you so much for your understanding,
A Resident