Mavis Discount Tire

All new Michelins installed on my Mercedes on Nov 17, 2019. (Mavis ord # 035509)
Within 2 years It looked like they were dry rotting, but I continued on.
A research on Google indicated that dry rot was being reported on Michelin tires but they were listing it happening after 6 years.
After 3 years and 23000 miles the tires were visibly dry rotting through tread and sidewalls.
I replaced all tires with new Continentals and following installation I asked the dealer to let me take pictures of date codes on side of tire.
2 tires were manufactured over 3 years before they were installed on my car.
ONE TIRE WAS MADE IN 2011 and OVER 8 YEARS before being placed on my car.

I had a tire replaced on the rear driver side of my Kia, the kids and I were on our way to an outing and decided to take the interstate, got up to 70mph, not two miles of me being on the interstate all of a sudden my car started to shake violently, and make some thumping noise. I pulled over to see that a Lug Stem and Nut were gone it had broke off, then the next lug stem was broken off into the hub, just hanging around in it with the lug nut, and the remaining three lug nuts were so loose that I was able to remove them with my hands without a sweat.

The tire almost came off of the car due to them not cross tightening the lug nuts. they just put them on and did not tighten them when the car was finally dropped down off of the lifts, and now they are making up [censored] lies saying that they did not even change that tire, that they changed the passenger side, and that they took off two of the passenger side, I asked why did they take off two tires when all I needed was one tire requested?