If you've reported it to the room assistants/hall monitors whatever they call them at Kent and they've done nothing satisfactory about it, report it to the person in charge of the residence and/or the people in charge of accomodation at the University.
If they don't make them stop, you're only option will be to move to a different hall or flat, which seems extreme, but if it means he gets sleep and pass, it's not too bad.
If they don't make them stop, you're only option will be to move to a different hall or flat, which seems extreme, but if it means he gets sleep and pass, it's not too bad.