Dear Paulhand,
thanks for your reply. Yes , have gone through the thread. As far as attempts to settle down in SA is concerned. We visited SA in Dec 2017 and lived there for few days.I agree it was not for months. My whole family have got Medicare cards issued by Centrelink Adelaide. Me and my wife has Bank accounts and ATM cards with bank balance and bank statements with SA address. Me and my wife also has the Proof of age cards issued by Service SA. We have TFN as well. But we returned back to Japan as I was not able to secure any job there. I applied for many jobs while being in Japan afterwards but got no replies.
cheers,