I would write to Jaguar, do not think that is acceptable, not unless you have done about 300,000 miles and the car is a right state, but guess that is not the case, you can have Jags from the old days still with seats that have not needed repairing, the only step would be to let the dealer know that you will have the seat inspected by an independent specialist and if the report tells you that it is not fair, wear and tear, then you will claim costs and expenses from the dealer, good luck, hope you get it sorted mate.