See...I am a retreatist (if there is such a word). Even *if* the landlord does what is necessary through courts, etc., I wouldn't want to live there anyways. It sets up a long path of arguments, etc.
I know moving stinks. Deposit, first and last month, all that junk. Not to mention the physical thing of doing it. Heck...I'm 8 months in and I still have not unpacked all my boxes.
I would say your best course of action is to pay for the exterminator yourself to negate any angry stuff from the landlord. I know that is hard.
Abbey