Citroen Refused to Address Bird Dropping Stains on My Brand-new C4

On December 24, 2022, I purchased a brand-new 2022 Citroen C4 with 0 km from the Gülan Citroen dealership, paying an additional ₺6,000 for metallic paint. I also purchased services such as ceramic coating, window tinting, rain-repellent windshield film, engine protection, seat protection, and hood protection for ₺7,500. Since the car was new and had a ceramic coating, I carefully maintained it, using only 0 pH shampoo and avoiding brushes. Despite this, bird droppings began staining the paint. Although I cleaned them immediately each time, 22 permanent stains now mar the roof and doors, all documented with photos. I reported the issue to Gülan Citroen, and an inspection file was opened. Photos taken with a cell phone were sent to Citroen Headquarters, but instead of conducting a proper paint quality assessment with micron measurements, I received a call stating it was "user error," and the case was closed. They refused to provide written documentation, which I needed to pursue legal action. As the stains increased, I approached another Citroen dealership, and after waiting 1.5 months for an appointment, the process was repeated. Again, cell phone photos were sent, and the case was rejected without documentation. Now, my brand-new Citroen C4, for which I paid extra for metallic paint and ceramic coating, is covered in stains that diminish its value. Despite my efforts to protect and maintain the car, Citroen has refused to take responsibility or even perform a thorough inspection. I paid ₺1.5 million for this vehicle. How is it acceptable for Citroen to treat customers this way? My car's value has dropped, and the seller is unwilling to provide any resolution. Does this align with Citroen's standards?