Hello there, I have a question regarding a private mechanic I used from gumtree. He had been working on my car for several weeks and what started out as just needing timing belts led to a new water pump, then mechanical issues until finally, my car engine gone. As he was working on car, he gave me authority to drive it but within 10 minutes of driving my car. It broke down, not once but 3 times and every time, he assured me that my car was ok to drive. Now he will not honour his work and I am left with a $6000 bill to restore a reconditioned engine. What are my legal avenues under Australian Consumer Law as I do not have receipts but have over 70 text messages with work he was doing on my car. I am on a carer's pension and don't know where I stand legally.