Hi!
It's frustrating to hear this. I am also chasing for the same issue for the last few days. Telstra told me the same that we can have ADSL through copper. Called Opticomm and said they are not looking after our estate.
Then I called NBN co and according to them our estate is not in their rollout map and told to contact the developer. Until unless the developer makes a request they can't do much about it.
Does anyone know if it is a must that the developer should provide the necessary infrastructure based on Government's Telecommunication Policy?