Audi Sold Me a Faulty 2015 Allroad and Refuses to Cover Water Damage Repairs

I took my 2015 Audi Allroad to the authorized Automol service due to water damage in the electronic control unit. All maintenance has always been done at the authorized service. They told me the unit had to be replaced but couldn’t find the source of the leak. I paid over ₺30,000 and got my car back. After 1-2 weeks, I noticed dampness in the same spot and returned to the service. This time, they claimed the water was coming from the sunroof mechanism, and the replacement part ordered from Germany would cost over ₺50,000. When I called Audi Türkiye, they got back to me after 3-4 days, stating that since the car is 10 years old, there’s no warranty coverage. I’m 50 years old and have owned around 20 German cars, but I’ve never encountered such an absurd issue. Engine and mechanical parts may wear out over time, but how does a sunroof frame crack? Either there’s a material quality issue or a manufacturing defect, as this part is constantly exposed to sun, rain, and cold. I refused to pay for the repair. If water gets in again and damages the control unit, would it be my fault? I expect Audi to stand by its vehicle and fix this issue.