Stop paying rent until it’s fixed. Keep receipts, take photos, document EVERYTHING. Start advising the PM and landlord that you would like to record all conversations on the topic in case they try some shady tactics.

Edit: consult an attorney first! They will probably try to evict you if you complain or withhold rent.

https://courts-state-nh-us.libguides.com/rentwithholding#:~:text=A%20tenant%20in%20NH%20has,tenant%20for%20nonpayment%20of%20rent.%22