I'm assuming this is a diesel, if petrol then ignore it :
Modern diesels have massive amounts of torque. So much that they are entirely capable of tearing a gearbox to bits. As such, between the clutch and the gearbox is a dual-mass flywheel, known as DMF. This is there to absorb 'torque shock' from entering the gearbox (especially in lower gears, where it would do most damage). So the flywheel is basically a sacrificial part. Flywheels are cheaper than gearbox rebuilds !
So, if you are adamant that the damage has not been caused by driver error, all I can suggest to you is that you insist on ALL damaged/worn out parts being provided to you, and you inform the garage that you will be taking the parts to an independent engineer for examination, and if the report comes back that they were not fit for purpose, then you will take the garage to Small Claims court for the sum involved.
Alternatively, go to an independent garage, and see about getting the clutch and DMF replaced for (probably) half the cost.
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