Goodyear Tyre — I am complaining about Tyre

I purchased ford ecosport last year 2021 and I got good year tyres with it but after one year one tyre have bubble issue. After complaining to good year customer care and got a call from his representative and asked to verify tyre to one of the good year outlet shop. They told me car hit in pothole so that your car’s tyre got internal cut and that’s why it is not in warranty and they are providing 30% discount on purchasing new tyres. I told them how to decide to tyre’s cut from my faults? I never hit the car in pothole, it can be manufacturing defect….one more funny thing, outlet owner told me if you purchase tyre from my shop then I will give 100% unconditional warranty. I am totally upset from Good year as well as outlet….