Car damaged during service

[goodpawn]

Hey all dunno if this is the right area for this but anyway. Sorry for the novel like length.
I booked my car in at a well known perfomance shop in Perth on monday for my Super pursuits 15000km service. I waited while the car was to have the oil changed etc.. After about an hour the owner of the workshop went down the back to check on the progress.
He came back and informed me that the clutch fluid was a bit gluggy(his words) and recommended a flush and fluid change.
I agreed thinking no big deal and proceeded to wait some more. After another 20 odd minutes he wanders down to the workshop again but when he comes back this time he say do you want the good news or the bad. He then tells me that the bleeder nipple? has broken off inside the concentric slave cylinder? and that he will need to drop the gearbox from the ute to fix it.
OK I say thinking that **** happens and I was unlucky. Turns out he cant get a part that day and I would have to wait until after lunch the next day before I can pick my car up. OK I say but my accomodation for the night is on the other side of Perth and I have no other transport options. He hums and hars for a minute then says that I can use his work ute(30 year old Triton).
At this point I have been waiting 3.5hours for my car and am keen to get back to my motel for the night. I turn up after lunch the next day and spend another 2 hours waiting for my car to be returned to me.

Now the fun part, I was expecting the bill to be $185 for the service and whatever the clutch fluid flush was going to be. He hands me a bill for $758, I nearly fell over. Why so high I query? Well he says it took my boys over four hours to remove gearbox, fit new slave cylinder and refit the gearbox.

At this stage all I wanted to do was get the keys to my car as I had a 4 hour drive ahead of me to get home and back to work the following day. So I paid the $758 for what I had thought was going to be a simple oil change on a 15000km car.
All up it took nearly 6 hours of my time plus the fuel to run the 30 year old Triton in peak hour traffic back to my accomodation and back to the workshop the next day which was along way out of my way.
Since I have been back at work a few people have commented that the workshop was liable for the labour plus the $168 for the replacement slave cylinder and that I should pursue this further to recoup my money.

Also the bleed nipple is metal and the slave cylinder plastic yet the metal part broke off inside the plastic. How is this possible?

I am seeking and information from anyone that has taken this route before and what their outcome was.
Rant over and thank you for your patience in reading this and responding(if anyone actually does)
Cheers
Goodpawn