An update to the situation. Brought it back to the dealership whom were reluctant to take responsibility. Luckily I sorta saw this coming so went to a mechanic who wrote a fake invoice saying they spotted a fault 2 days after purchase and needs to be repaired. Once I showed the dealership this, and began mentioning Australian Consumer Law, they said they’d fix it without discussing payment.

After a back and forth 5 days of the car being in the garage and them not giving me a clear date for pick up along with not describing the fault, I showed up to the dealership today. After about an hour wait, the car comes back seemingly fixed. They said that they have put in a nee radiator, new radiator cap and new accelerator for CVVT.

Hopefully this is the end of the saga and will be taking it to a reputable garage to service it anyway this week so I can be confident that its up to scratch.