MRF Tyres — Tyre bulge

My vehicle is honda city idtec running km 29000 have a bulge on front tyre which i sent to the mrf company and got reply that there is no manufacturing defect. Then why this happens..and what should we do...? If this is your product quality..how can we trust your product..?i need my tyre get replaced..how to proceed further..?if i am not getting a positive reply i won't recommend anyone to buy mrf products.. and will go to consumer court for justice..
thank you