We have someone from BlueScope Steel on site the other day to check our rain water tank and confirmed there's a problem with the pump. Unfortunately due to the holiday we have to wait until early January to have the plumber back to fix the pump.
The insulation fix work was completed as well, will try to post a few photos later.
The most important update however, is our court case against Demir Leather. After a few months' of fight, we lodged an application to the NSW Consumer, Trader & Tenancy Tribunal (CTTT) and they finally decided to refund our deposit. A huge victory for us!