2009 LEXUS RX Tires Problems

I was advise by one of the mechanic to change tires immediately. Since my Grand daughter occasionally drive the card, due to safety, We bought 4 set of Brand New Good Year Assurant Outlast Tires immediately (235/55 R18) from Walmart at Farmingdale, NY on 6/12/2023 at 8:00 PM. Walmart stated that they could not put tire on my car for another week so I decided to take tires to my local mechanic who put ALL 4 tires next day in the morning. All tires were installed; however, after driving for about 15 miles, I saw my car pulling. I pulled in safe area and notice that the car was tire was flat. I towed car to the mechanic who installed it. He stated that tire is leaking from side and is NO Good! I went to Walmart to complain about the tire. They punted the problem to call Good Year....

I AM WRITING TO ADDRESS FAULTY COOPER EVOLUTION TOUR 100V TIRES - TREAD SEPARATION IN 3 YEARS AND 5,102 MILES. ATTACHED ARE 2 DOCUMENTS THAT WILL INDICATE THE FOLLOWING: 12/05/2018 4 COOPER EVOLUTION TOUR 100V TIRES PURCHASED AT TIRE KINGDOM POMPANO BEACH FLORIDA $ 501.89 @ 81,140 MILES. 11/26/2021 4 MICHELIN PRIMACY MXM4 TIRES PURCHASED AT J M LEXUS MARGATE FLORIDA $1,035.92 @ 86,242 MILES. WE TRAVELED TO VENICE, FLORIDA ON 11/15/2021 AND RETURNED 11/19/2021. ON OUR RETURN TRIP THE CAR (2009 LEXUS RX350) BEGAN TO SHAKE AND VIBRATE VIOLENTLY! WE WERE SCARED AND CONCERNED FOR OUR SAFETY ! WE IMMEDIATELY BROUGHT OUR CAR TO J M LEXUS TO CORRECT THIS DANGEROUS SITUATION! THEY INDICATED TIRE TREAD SEPARATION HAD OCCURED, AND ALL 4 TIRES NEEDED TO BE REPLACED. INCIDENTALLY, I OWN 2 OTHER LEXUS RX350'S IN CONNECTICUT, AND I HAVE COOPER TIRES ON BOTH. NO PROBLEMS WITH THE 8 CONNECTICUT...