GoodYear no longer honours Warranty?

It would appear from my current exprience with a problem Goodyear tyre that since pulling out of SA, they may be resistant to honouring warrantee/guarantee. Doesn't fill me with any confidence to buy any. I bought a pair of Goodyears only to discover after about 1 000km a persisting vibration. I reverted to the dealer who said it was a 'flat spot'. Remedy, swop types to rear of vehilce and drive for 10 000km. Well 10 000km is now up and the rear wheel is not safe to drive on. Reverted to dealer who approached Goodyear reps, who are incredbily difficult to contact; I was eventually given the number of Goodyear Tek Head (one Jade) who suggested I provide more photos and undertake a wheel alignment. This I've done. The alignment was underetaken by specialists who took one look at the tyre and commented that judging by the nature of the damage, the tyre was defective. There are no consistent signs of damage caused by alignment. Nonetheless an alignment exercise was undertaken and the results showed no adjustments were required to the alignment, cast, or camber, of the vehicle since all indicators are in specification. Goodyear Tek Head has looked at my amateur photos and declared an alignment problem. Two dealers and a speciast on physically viewing the tyre, all agree a defective manufacture. The tyre was made in Poland in 04/2022. Goodyear need to honour their warranty at 1 000km.