BMW 216 d Gran Coupe Repair Dissatisfaction

My BMW 216 d Gran Coupe 2020 model vehicle experienced a malfunction at 91 thousand km, despite regular maintenance and repairs at authorized Borusan Oto services. Unfortunately, it left me stranded on the road during my holiday. I promptly halted for the issue at hand and, after enduring a 6-hour wait, I had it transported to the authorized service center 300 km away with the assistance of a tow truck. They contacted me on the first day of work and let me know that the v-belt was damaged. They explained that three parts needed to be replaced along with the belt, and that I would have to wait for at least 30 days. Unfortunately, they couldn't offer a substitute vehicle, even if I wanted one. They also mentioned that the cost for the repairs would be around 50-60 thousand TL. Even though the warranty has expired, I make it a point to travel 300 km for even the smallest malfunction. I always go to the nearest authorized service center and exclusively have all my maintenance and repairs done there. I visited the service center five days prior to the breakdown and had performed general periodic maintenance four months ago. It is recommended to replace this broken belt as no maintenance or repair has been suggested. The belt is designed to be durable and long-lasting, ensuring it won't wear out or break shortly after the last maintenance. This clearly demonstrates that the controls were not conducted adequately. I reached out to the brand to request a belt replacement under their goodwill guarantee, but it's been a week and I still haven't received a response. No response has been provided. If this doesn't address my concerns about negligence and victimization, I won't be purchasing or using a vehicle from Borusan Oto and the BMW brand in the future. I prefer to avoid using a brand that may leave me stranded without any assistance. I urgently need a response from Borusan Oto regarding this matter.