Goodyear bad tyres

Good Day I have bought 4 x Goodyear Efficient grip tyres from Minty,s in Bedfordview on 17/03/2018. The tyres has now up to date only 14000km on. I had a terrible vibration on the vehicle now recently. I took it to my local tyre dealer and he informed me that the tyre is actually tearing in the middle on the inside of the tyre which is a bad manufacture. I then replaced it with my spare wheel and the vibration was gone. I had a representative from Goodyear to come see me yesterday on 14/05/2019. He informed me that it is the wheel alignment on the vehicle. I disagree as I had it recently checked for alignment. If your alignment is incorrect, the tyres will run off on the outer sides. This tyre is tearing from the inside exactly in the middle. This is just an excuse for a bad tyre. This is actually the second one from the 4 tyres. The 1st one did that on 10000km. Will definitely not use Goodyear in the future on one of my vehicles.