Friggin people

Im having a problem with a garage now that told my gf that they are selling her 80,000 warranty tires. She, of course, paid extra for those. Total bill is $800. They are now at 36,000 miles and all 4 tires have busted belts. She bought these in Feb/March of this year- she does child services-alot of miles. Anyway- we told this garage at around 30k miles that they were bad. Right on the receipt- it says "rotate every 5-6000 miles." Two different people there said the tires were shot. Hmmm- 80k tires shot at 30k??? All highway miles at that! They said-you didnt rotate them every 2-3ooo miles. Hmmm- receipt says different. Now they say- tire companyprob wont cover them because we didnt rotate them enough. Now they want us to send pics of the tires in. They already saw them and felt they had busted belts!! Last time I talked to him, I told him that they are 80k tires, they arent even 1/2 way on the mileage! To top it off- when I first checked them- they showed-all 4 tires- 28psi. Max press is 44psi. I always set them at 40-42psi. So- he had them underinflated to begin with- that will bust belts. Im at a loss here- maybe this is in the right post but it sounded good lol.
That sucks. Never had a problem, yet, with Discount. When we got my the Explore the previous owner had just put cheap tires on it. Belts shifted on one of them. They replace it. Another one got a lump a couple days later. Went back and the guy said he did not want to deal with chasing these junk tires anymore. He sold us a set of Michelin's, only charged us for 2 of them and threw the certificates in for free.....