Doing guess work at my expense

They deserve a minus star rating. Kuilsriver Ford doesn't know what they are doing, they want to charge me R44 000 to fix a clutch. They already made me pay R8 000 to change the Master cylinder (which didn't fix the problem like they assumed it would and kept telling me it's a bleeding problem for the 2 times I had to take the car back to them), now they want me to change all the clutch parts (clutch kit and the fly wheel, and the slave cylinder) because they don't know what the hell they are doing. To me it seems like it's a leaking releasing bearing issue because the clutch works for a few K's but after some time it doesn't pop back up after pressing it down and I did tell the mechanic there seems to be a leak that is clearly visible and he ignored me. They are doing guess work at my expense. They had the car from 31 June, it's been 21 days to try and fix a simple clutch.