I'm also on Aussie. Iphone still ok although did have the game centre alert a few times earlier. Ipad also had the alerts but was fine until 20-30 mins ago. No keeps saying can't load as must be connected to the internet. I can get into MW and CoC alright, updated a heap of crap on wife's ipad for her, uninstalled CC and downloaded again and then even shutdown device. I clearly have connection but only Cc won't load. I have noted that when I log out of Game Centre it shows as logging out but when I go back to it it is logged in again. I even put a wrong password in to get an error message. I then exited and went back to setting and bingo.....still logged into GC.
I thought the issue maybe related to GC but the iphone is logged into a different GC and I can access both accounts linked to that GC fine