If you move into a dump and a brothel, expect to find that it's a dump and a brothel. I can never understand people who have two eyes, and yet they move into places and start complaining about issues that they could have seen beforehand with those two eyes.
If the ceiling caves in, and johns and prostitutes are running into you in the hallways, and hitting your car, you need to get out of that cesspool quickly. Why even bother calling the landlord to complain? Did you imagine that your call to the landlord would result in him evicitng all the trash in your building and suddently deciding to spend thousands upon thousands of dollars to repair his decrepit structure? Not likely. In such a situation, the best thing to do is not complain to the landlord and threaten him, not call the police, not file court papers, not call the city code enforcement department, but just MOVE OUT and, on the way out, kick yourself in the behind for moving into this toilet in the first place and resolve to never make that mistake again.
The landlord runs a toilet and he has as tenants the kind of things that live in toilets. You aren't that kind of person so you don't fit, and the sooner you realize this and leave the better. You'll be happiest if you don't prolong the suffering by trying to engage in legal actions.