Audi Ludhiana — Bulge in tyres

I have bought a audi a4 and there has being a bulge in all my tyres but the audi ludhiana dealer is not listening to me and he is saying this is all due to bad road conditions. I just want to say if it is due to bad road conditions why ar they insisting on the same tyres which cannot with stand indian road conditions. The tyres are firelli make.
I have asked for the replacement of the tyres but they are not listening.