Front left of tyre and left of bulge in rear of tyre

Hello, I’m new here in the forum and hope someone can help me. I’m grateful for every good advice. So it’s like that, on Christmas Eve in the middle of the night, on a ride of the left front tires burst, after I had the car rolled out and stood at the roadside, I saw that the rear left tire had a roughly chicken-sized bump. So I changed the tires, so far so good. After the holidays I drove into the workshop to have the track adjusted, because i The fitter said that he had a guess, that he had mounted the tire with the bump from the rim and showed me a damage inside the tire, he also showed me how this damage could most likely have occurred on the tyre moth machine. I went to the sellers of the tires, the tires were only 1 year old and have run up to 7000 km, with the help of the tire manufacturer. I have been asked for a tire insurance and was skimmed off. What can I do? I add a damage picture of the tire inside and the broken tire. Can it be that these damages also have other causes than those described by me? Thank you very much. Dieseldietmar