Locked attic door in my rental with strange noises.

It’s directly up the stairs, next to two bedrooms that dont have any form of access to the room. Based on the houses layout, the room is one of the largest in the house with 2 blacked out windows that face the front of the home and this one short door. All attic enterance spaces in the lower part of the house have been sealed off and popcorned over, although you can still see the indentions in the ceiling spaces. We keep hearing furniture being moved across the floor, loud banging like someone falling to the floor or dropping something and occational speaking like perhaps from a television? The rooms are so hot up there that we cant stand to be up there, but this attic room radiates cold air when you pull on the door and we can hear an ac humming from inside. The landlord wont acknowledge the room at all; when asked, he just repeats the ammount of rooms and bathrooms we’re being leased, all of which doesnt include this room. What should I do? I wouldnt bother with it, but at this point its hard to sleep through the noises. Im open to suggestions, or any fun theories to distract from the irritation of lost sleep. Tia!