catastrophic fault from the tyre dealer and now 2 x used or 4 x new?

Hello together, as always my stored wheels have changed at my very renowned tyre dealer on site. From winter to summer logically. I always clean the rims shooting, although a wheel wash takes place at the dealer. I noticed that a tire has an extreme cut in the tyre flank where also a piece of rubber hangs around. Another tire is also snapped off on the rim protective strip of the rubber. Both tires are actually not for me I then informed my tyre dealer. He looked at this and said one tyre had to be changed, with the other one I could continue driving. That this was overlooked when changing on the same day is a scandal. Of course, mistakes can happen, but with safety it will be difficult for me. At least when looking at the error was noticeable. There was hardly an excuse and there was no agreement either. dealer on site, where I have otherwise felt well taken care of, all doors open to at least apologize. Instead, I have to listen to myself that you have to notice such damage yourself. Yes, you may have to be aware of this damage while storing and reassembly. I am pretty angry and will change the tyre dealer. My previous was also not the Cheapest. Heisst not expensive in reverse is also better than gün I drive the tyre size 195/40 R17. This is a pretty stupid size, because there are hardly any alternatives. My tyres are from 2020 and still have 5-6 mm profile. the car is moving about 5 tsd km a year. half summer/winter. I now have an offer where I can get 2 same tires (Goodyear EfficientGrip Performance) from the same year of production (2020). Also these have still 6 mm profile. Since there are only China Buller and then only 2-3 brand tires which however also shore now the question is whether I take 2 used brand tires from the same year or which 4 China bulls. At the annual running performance I am somewhat unreliable. Besides, I don’t know what it’s like if 4 years old brand tires are better than 4 new no name tires. What do you say? Thank you!