I do NOT like the polish

I want to kill the polish girls that live with us :) Yesterday one of them came out and screamed "get the fuck out" to our friends and now they just started playing EXTREMELY high music, while we are studying. I asked nicely for them to turn it down, they look at me with a bitchy look and say yes but never do it. Over new years they had a party in the apartment too and never cleaned properly. I really do want to get mad but I am a coward when it comes to confrontation.