Maruti Suzuki India — Bubble coming up in 6 month old wagon r stingray

Address:	Meerut, Uttar Pradesh, 250002
Website:	www.marutisuzuki.com

This to ring to your notice that i had bought a Wagon r stingray on 14 june 2015 bearing goodyear tyres after a few months bubble came up in the tyre and when i informed maruti about this there was no reply. Then i approached the dealer after which my tyre was inspected by the engineer of goodyear and he just only said that tyre has an external impact, i told him to show me signs of impact and he wasn't able to clearly state his point. After a months time the dealer gave a tyre on its own. i don't why. Now one tyre changed and again i notice another bubble in the other tyre again the same process is repeated and still maruti has nothing to do with this as not replying even to the mails. Goodyear engineer once again stated his old line "DUE TO EXTERNAL IMPACT" and wasn't able to satisfy my questions. I would like to add that the problem has occured in 2 of my tyres, now what is the gaurentte that the remaing 3 tyres won't create a mess like these have done. The first tyre was replaced in a month time by dealer itself. After several reminders to maruti, you didn't responded to a single mail