You got screwed royally. Never take a car to the dealer for repair work, they will rape you. You already gave them the money, I would take it back and demand they fix it right. For $1300 you could have bought all new hydraulics and the most expensive clutch setup Australia has to offer.

Now all you have is a worn clutch and a new slave. What other parts did they claim to replace besides the slave? What year car and what mods do you have? I've never liked the way the bleeder is positioned on the tranny, what a freaking mess. Using a Mitey Vac is much cleaner, but it sounds like you have bigger issues than just air in the lines.