So you dropped your phone and it broke. The courier didn't pick your phone up when they were meant to. The repair centre is not communicating with you. Now the phone hasn't been sent back to you. How is any of this Nokia's fault? I understand you're angry at the situation, I would be too, but this is outside of Nokia's control.
I agree the service is terrible, but there are no Nokia repair centres, they are all repair centres which repair any phone brand. They aren't Nokia repair centres. It's a bit out of their control. If you broke a phone with any other brand, you'll be going through the same thing. Unless you buy an iphone. This is not a Nokia problem, this is an Australian customer service problem.