Tire Tread/belt problems of the 2000 Chevrolet S10

Tire separation of passenger rear while driving down street. Business where tires purchased no longer in business; called around town, no one has my particular brand of tire. Did internet search and found various articles concerning premature tire separation of certain models of kelly springfield tires/goodyear. Called goodyear and they denied any recalls for kelly safari awrs. Referred me to a local business: owner stated that tire is defective. Replacement given with pro-rated charge. Tires are: kelly safari awr 32x11. 50r15lt. Dot: pjyk ktkv 467. Since when does a consumer pay for defective parts?.