Jk Tyre — Very poor tyrer quality

I bought a Zen Estilo Vxi car with OEM fitted JK tyre, - vehicle and tyre made in Aug 2007.
Till date the vehicle has done 26,000 kms.
The tyre wear is normal and the car and tyre are under warranty.
The tyres are of very poor build quality the tyres are bulged, giving a bumpy ride.

Tyre repair shops tell the tyre is of poor quality and has manufacturing defect.
JKi customer service is non existant and is very surprising the tyre to develop such defects within 2 yrs /26k km.
Two tyres are in bad shape and the rest three are slightly better.

How such poor quality tyres are fitted?
is Maruti responsible for such tyre selection or JK responsible for such poor quality?
Ultimately we the car buyers are left in the lurch, high and dry.