i read the entire post and i'm like
i'm outta here...
then your last statement was PS i don't wanna move...
if i were you....I'D MOVE

sounds like shit isn't going to get better...you think their friends are going to park elsewhere when i'm sure they know it's not the owner's car? doubt it.
so you stop paying for the spot and park on the street. you're going to still have these problems:
-loud as fuck. that's how they live - not going to change IMO
-cable most likely will eventually change. Telus/Shaw are slow & busy so it can be 1 to 2 months (had that happen before)
-internet - if there's poor signal you think they're smart enough or tech savvy to solve the signal problem? i highly doubt it. maybe they buy a repeater, do a bridge better router who knows...i'm banking on the average person won't know how or just plain won't and tell you to deal with it.
that's my 2 cents anyways...where do you live BTW?
if i was you i'd just pay what i owe them and move on.