Maruti Suzuki — Replacing Synchrinizer

I own one Ertiga (VDi) (Reg. No.KL41F2978) Engine No. 1855693 purchased in May 2012. It has completed 44, 000 K.M. It is a single used vehicle. Apart from the above Ertiga my wife own one Alto K-10 (KL 41G9785. My first vehicle was also Wagon – R. Day before yesterday while I was driving Ertiga, I could not down the gear from third to second. When I showed the Vehicle in a Maruti Authorised Service Centre, they told me the Synchronizer of the vehicle has got complaint and it has to be replaced. For replacing the above I have to pay. I strongly believe it is a manufacturing defect from your part for which I am not responsible. This type of complaint should not have happened unless and until there is major accident or related incident. So I request you to replace the defect at free of cost. Expecting your early reply. Bosco Paul