Okay, so yesterday I was working on my motorcycle and got it to a point where it wouldn't start. I called a mechanic and on the phone, he said it would take him half an hour and it would cost around $44. I took the bike to him and waited the day for the repair. When I arrived back, he told me that the kick start lever had a clip come off in the engine and it wouldn't be worth getting it repaired (as it is a postie bike and I spent about $700 on it). He said the labour would be about $99 or I could just leave the bike as payment. In the moment, I felt he was doing me a favour so I wrote out something along the lines of 'I, Justin Lillico, give my Honda CT110 to < business name> for labour costs.' I did not specify an amount and I didn't sign it. I have since realised that I could repair it myself for far less than they were telling me and I feel as though they ripped me off. As it was late Friday, I have to wait until Monday to do anything and I was just wondering if I have any legal grounds, like a cooling off period or Australian Consumer Law or something. The kick pedal was working when I have it to him and he could have well broke it for all I know. It seems suspicious. He may yet just agree to give it back but I was just wondering, is there anything else I can do?