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having the clutch replaced under warrenty is always a contentious item - as unless its exploded into a hundred pieces its very difficult to prove that its faulty especially as its possible to abuse a clutch and provoke rapid wear - not that you've done this but its obviously possible to do this.
These cars are know to have issues with the clutch hydraulics though? there's no recall out for it but often bleeding the hydraulics to completly refresh the fluid will resolve gear selection issues
have you seen the actual clutch parts that were changed?
was the friction disk worn down to the rivets?
If you haven't then I'd ask to see them