FIAT Doblo 1.9 multijet - Gearbox problem - le brusc

My three year old dolo with 25000 miles on the clock requires a new gearbox.It is three weeks out of warranty and Fiat have offered only 200pounds towards a cost quoted at Oldham Fiat of 1900 pounds.Oil levels were correct and the car not been abused in any way.

FIAT Doblo 1.9 multijet - Gearbox problem - LucyBC
Full service history? Any indication as to cause of fault?
FIAT Doblo 1.9 multijet - Gearbox problem - Dutchie
This to me is a manufacturing problem