The people on my floor in my dorm are actual disgusting and annoying and the RA does nothing about it?

They always leave trash in the windowsills in the common area on our floor, they blast music every night and tonight, they put a used condom on this girl’s doorknob, put bbq sauce on this other girl’s door and the RA said “not my job”..... this is not the first instance of disgustings. What should I do?