Legally heavily depends on where you live, many places have a step before that where there are legal bodies you can report them to for such things. You’d have to consult your city’s help line to get more info and figure out who you talk to about that.

Assuming that somehow doesnt get results then, yes, the next step is suing the landlord for your rent back, which can potentially go in your favor as legally in most places the landlord has a legal duty to maintain the building for the tenant and if they dont do that, you dont owe them rent and can get it back.