Engine damage Audi RS5 with only 53,000 KM

Hello guys, I have a big problem, my Audi RS5 (which I sold) has an engine damage of just 53,000 KM. The car is just 2.5 years old. All inspections were made at Audi, no tuning or similar. Audi turns out to be cross and doesn’t want to take over a cent on the wheel, even the 300,- Euro for the damage detection are calculated. The car was moved with overpass mark, and at approx. 100 KM/H simply gave up the “spirit”. (Out of the way). I would be happy about a feedback, or maybe someone has experienced the same fate and can give me a few tips. I don’t want to take the whole thing that easy. Thank you and nice greeting Freeman