It would take a lot of abuse or riding of the clutch pedal to get a failure after such a short time, however with persistance it can be done!
If your dad has not had a short clutch life with any previous car, then maybe a mechanical fault in the clutch assembly has caused it to fail.
I think without you managing to get hold of the failed assembly and getting it independently inspected, you'll have an impossible job of proving it was. I don't think there is a chance that the dealer will change their opinion without this.
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