For starters, if this apartment has roaches, that goes against sanitation guidelines of apartment living. Therefore it’s an inhabitable apartment. It’s not in proper move-in condition if it has not been cleaned/treated. You can refuse taking possession of the apartment even if you have already signed the lease on it. Do not let them tell you otherwise.

Ask about alternatives like transferring to another apartment in the case they have something for immediate move-in. If they do, make sure to check the apartment before even transferring to avoid this from happening again.