G'Day jus
I rented a place once which had a real Tyrant for a Property Manager
As soon as I became a Landlord, I immediately called her up and gave her the listing!
I would want a Property Manager to 'keep the tenants on their toes' so while you may be feeling put upon now (and so would I!), if you do buy the place and later rent it, you may find that you want a PM who is a stickler for presentation
What's the old saying?
No one is your Enemy, and No one is your Friend, but each One is your Teacher.
Whether you consider that you are being fairly treated or not, as a property investor each experience is a learning curve
Good luck, and why not buy the place and put yourself out of your misery!
Cheers
Kristine