I have 2 downstairs neighbours, the stereotype chav, drug taking slappers, who put their music on so loud it makes our floor shake(we have wooden floors) and she come in at all hours drunk, and even when sober slams doors, shouts screams and swears and had loads of lads round for a "party" which involves the girls screaming "ooooh oooh" non stop at the top of their voices. They also have a bass guitar which they put on full, and a few parcels of mine have gone missing.
A few times they have had all night parties till 8am, plus these girls never seem to sleep at all, they are always awake(probably the drugs)
They are friendly to us to our face but its the parties and the door slamming at all hours, the dogs barking and coming towards us threateningly.
The Agency which owns the flats isnt bothered, and tells us its up to us to sort.
After 4 months of this I have flipped and put my music on as loud as them, and THEY have the have the cheek to hammer on my ceiling as if to say shut up, and I hear them swearing and and shouting shut up, even though I can hear their music ABOVE MINE! Says a lot.