Bridgestone Tyres India — complaining about my tyre

My tyre has 3 years warranty and it is deshaped within six months i have send it to company by the help of my dealer and they returned old tyre and saying it happened due hard hitting or pinching. Inside of the tyre there is no damage amd in the rejected form they marked as damage occured inside the tyre. I didn't travelled a long distance also. Help me plzz...