Babe, ring Centrelink and get there advise.

If he cant function as "independant", then maybe there is a way to have him reclassed as "dependant"?

I would also be laying the law down, hard. He is almost of adult legal age, and he has no idea how to pay his own way. Not a good thing. If it were me, He would be locked out of fridge, cupbourd, phone, hot water etc till he paid his rent. He has to learn the neccecities come first, or he has a very hard road ahead of him.

Good luck sweets.....