Consumer Redressal

There is a swelling of the side tyre wall of one bridgestone tyre on my newly purchased Innova that has done merely 17349 kms.the service engineer of Bridgestone Company had inspected this one tyre(size 205/65 R15 pattern B390 bearing serial No. CEJ 2214) which came as an OE Fitment in my vehicle Innova, and after inspecting he reported that damage in the tyre was Pinch cut damage cause due to pinching/severe impact of the sidewall of the tyre between rim flange and an external hard object resulting in damage to inner plycords causing Bulge on Sidewall.They claim that since such damage is not due to manufacturing defect,they will not accept fault. My submission is the tyre in question has no other visible cuts or damage,looks new so to put down the swelling as "owing to impact"is unethicalas there has been no extraordinary impact and if the tyre cannot take normal impact of indian city roads then the tyre is weak and of poor quality.How can a multinationalget away with this?!!