Rude Neighbors!

We just moved into our new apartment about 2 months ago actually under 2 months ago. Its alot of fun having our own space and even though its tiny its really cozy and perfect for us! ...however its hard to get used to neighbors especially ones who are rude and cant control thier volume. our neighbors right below us are so noisy they are loud and they always have thier bass on. we have talked to them a couple times but they continued to ignore us. They also smoke alot which they got in trouble for cause they dont take care of thier butts and there is alwasy ashes all over the sidewalk. lots of times we have woken up to lots of noise which most likely was them having a party. last night however I woke up to them screaming and swearing loudly and slamming doors and pounding on the walls. I warned them and they only just continued and continued. Of course when this is going on its the weekend Anthony is out of town so i try to sit it out and wait for them to stop but it didnt they just kept screaming and fighting and slamming stuff. I finally called the cops, they came and im not sure exactly what happened but they were quiet after that. I talked to my landlord today he got the police report and filed it and also wrote up another warning for disturbance but its still not enough. He said they need another written or another police report.
.... I dont understand why people act like this i mean its common courtesy. Im not saying they have to be completely silent cause i mean living in an apartment noise is pretty much unavoidable but atleast have the sense to turn off your bass especially at night and to keep parties under control and clean up after your smoking habits, and nobody needs to get into screaming matches in the middle of the night. Its absolutely ridiculous and rude!