Cut me a break!

Can I get a break on this whole car issue?

So about 6 weeks ago we decided to sell our car, a little old Holden Gemini, within 2-3 days someone wanted to buy it - without advertising it. So we "sold" it to them, and organised to get a roadworthy certificate.
Because we knew the person through our parents, we decided not to worry about taking a deposit. mistake Number 1.

So in order to get the roadworthy they had to do some work on the car - fix locks $130. General repairs - including oil leaks, engine mount and tyres $570

This was after the car yard's mechanic quit and they sent the car elsewhere to get fixed/inspected and kept me waiting for like 1 week.

Then the woman rings up and says she doesnt want the car until after the 1st July.

Note: Roadworthy certificates are only valid for 30 days

A couple who was moving here from mauritius said they were interested in buyin the car, so we held it for 2 weeks without advertising it for them. They arrived with 4 days remaining on the roadworthy and said they didn't want to buy it for the price. Mistake Number 2.

So we put it up on carsales.com.au - and had 4 phone calls within 3 days. A family came over to buy it and paid a deposit. I said "I'll just organise the roadworthy and let you know" Thinking that the roadworthy was a done deal, given of course the $700 spent on fixing the car last time.

I took the car to a reputable mechanic this time that i know well - rather than going back to the same dodgey place mistake number 3.

So i raced off home last night to pick the car up and when I arrived they said it didn't pass for all the same reasons plus more.

So I am sitting here waiting for 9am to come so I can call up the dodgey brothers place that charged me $700 the first time to do F-all.

Meanwhile - can I have a bloody break from stress for 5 minutes please? (Mum, Grandma, uni results, work)