I have NO idea what is available there in Australia, sorry. Please call your breeder right away and get some help.
Please read our To Wean or Not To Wean article because you may decide you should let the breeder finish hand feeding the bird, like he/she should have before they sold the bird to you.
Also, if this breeder does not take their birds to an avian vet for health checks, take back the bird and find a reputable breeder that doesn't sell unweaned chicks and has healthy birds.