This sounds very familiar, similar issue I had with Dunlops sportsmax GT I also have pictures for my Audi garage. who were initially non-plussed until I threatened to return the car.
I had taken out the wheel and tyre insurance, you have never heard such a "palaver" I sent in the pictures as requested to them and the so called insurer and that was it, heard nothing back. I was stranded with a 2 flat front tyres, only having the car for two months and done possibly 500 miles. Off course I had to shell out the better side of 500 for two replacements.
Long story short all my initial payment s to the insurers refunded, the garage eventually refunded me for the tyres.
The only issue I take with the this is they shouldn't have been on the car in the first place, ultimately the tyre garage noticed the years difference in the tyres, two were from 2015, one from 2016 and one 2017(before the car was made??).
Hope you sort this out as there is clearly and issue with these tyres, once a week now check the tyre pressures, don't rely on the DIS it doesn't report. I had no warning of early deflation, the first time I realised the loss of pressure was turning a corner and thinking I was dragging my exhaust on the ground - that was the rim touching the tarmac at 10 mph.