I’m guessing it’s all too much to deal with and he’s shutting down? You can try a financial counsellor, some community centres have them free for low income earners

Edit: I don’t want to ask your area and can’t link google results on mobile but just search ‘financial counselling free victoria’.

I’m not sure what to do about him refusing to deal with it and the friction that results. I’ve had a few people coming for me for help but refusing actual assistance and it’s a very difficult situation.

You could pick one reputable number (one off the Consumer Affairs site or the Salvos) and write it on a post it. Or call them sitting with him.

But if he’s shutting down or lashing out then all you can do is remember that he’s an adult and responsible for himself. And check whether his finances affect yours.