This is by far the most frustrating post office I've ever been to in Australia. I have never met ruder staff, who make everything the customer's problem. When people have genuine complaints they're met with a shouted "You go away" from the post office staff, and I've seen them yelling at customers (and myself) for no discernible reason.
I've seen customers break down in tears through frustration of dealing with the rude and arrogant staff.
My advice is if you can avoid this post office in any way, do so.