My good friend had an issue where her DP left her when she was 5 months pregnant and then suddenly started saying the baby wasn't his.
She named him to Centrelink & to CSA who then pursued him for payment and to do a paternity test. The day came where he was meant to turn up for the test and he was a no show.. my friend went to court where the magistrate put down that her Ex was the father of the baby and he was to pay child supprt for his child. Her child is now 5 and she has never seen a payment from the father, but she does get full rate of FTB A & B as well as Parenting Payment.

I hope everything works out for you