My number for Walt Disney Travel company on the back of my travel documents I have is 407-828-8101.. but my number for CRO is 407-939-6244. CRO is the one I usually call.
Since it is Sunday and free for me, I just called the 828-8101 number and got Walt Disney Travel... you should be fine! Press two when the nice man comes on the phone to modify your reservation!
Just curious, what time will it be for you when it is 7AM Eastern here? I work for a conferencing company and talk to alot of tired sounding Japaneese people at 7:30 in the morning Florida time! I also get people from European countries, but not Australia very often!