if they have replaced all the other parts, and not fixed it yet, they probably didn't need replacing, and you should ask for your money back, or at least a reduction. I know it sounds easy to tell someone to do that over t'interweb, but fact of the matter is, if you took it to the garage and said "fix the clutch", then it is down to them to diagnose and replace what is faulty.
but as andytd4auto said, depends how spectacularly the clutch failed.
Do you have any fast fit clutch centres like "mr clutch", as they might be able to offer some advice. They quoted £300 all in to change the clutch on roberth's td4, so might be worth a call.
is the garage giving you grief the one you bought it from ?