Bad Goodyear brand on offer

Probably a victim of product dumping. Bought two, 4 sets of tyres for different cars (width and aspect ratio different). The brand for all was Goodyear Efficient Grip Performance(NOT THE UPDATED 2). Both cars are dangerous on the road especially on extreme weather conditions. Even on normal days you will feel like you are on a boat with how wobbly they are. R13K+ after, we still need to replace tyres that are 2 months old. Should we have known/advised on how bad the sidewalls of this brand are, we would have opted for another brand even if it meant paying a premium.

Other tyre fitment centres have tried balancing but they attribute to problem to wobbly tyres and not the balancing being an issue

If the manufacturer has updated the product version to remedy the shortfall of the predessor then what the reason for the customers to continue being offered the old version.