Renting an apartment with issues

[Precious Thompson]

I recently signed a lease to rent an apartment , but during the viewing i missed some key issues with holes and openings in some of the walls which allows mice and other insects to come in if chosen to , also a basement window that doesn't lock .(not the best neighborhood either)  The property management company seems to be taking there time to fix these issues even after they spoke to the terminator who brought this to my attention in which they hired , how should i handle the situation to get things taken care of?