Toyota — innova crysta touring sport tire bulge problem

Address:

Near Shani Mandir, Bhopal, Madhya Pradesh, 465685

I bought Innova Crysta Touring sport Model in March end 2018.
i have hardly run it 7000 kms and there is issue with Tires.

it has Bridgestone tire 215/55R17
3 out of four ground tire has started showing Bulge in side wall.
there is no hard impact during driving which is evident in the fact that alloy wheels have no dent etc..
i have heard in various forums that many customers having Innova crysta similar tire are having similar problem.

i have contacted Toyota dealership for the same and got it surveyed by Tire maker for manufacturing issue, and found no manufacturing defect.

i think there is some problem with Toyota design due to which such low aspect ration tires are getting damaged due to heavy load.

i need resolution from Toyota about my issue.