Citroen Authorized Service's Poor Performance and Dismissive Attitude

I reside in Didim, Aydın, which is 179 km away from Izmir. On July 11, 2023, I left my car at the authorized service center of Citroen in Karşıyaka, Izmir, for a windshield replacement. I also spoke to the service advisor, Tülay, and requested an appointment for the next day regarding the vehicle's shaking issue during operation. She assured me that after the windshield replacement, she would have the car inspected without the need for an appointment. So, I returned to Didim by bus (a 4-hour journey). On July 13, 2023, I confirmed with the claims advisor, Volkan, that the windshield was installed and handed over to Tülay around noon. When I called Tülay, she mentioned that the car had arrived, and she would have it inspected and call me back. However, when I contacted her the next day, she responded in a rude and dismissive manner, questioning if I had an appointment. She said, "I'm inspecting your car without an appointment, and you're asking me for an explanation?" I remained calm and didn't argue. On July 14, 2023, Tülay called me at 11:30 AM, informing me that the issues with my car had been resolved and I could come and pick it up. After another 4-hour bus and minibus journey, I collected my car and noticed that the windshield was perfectly installed, but the shaking issue remained unresolved. When I asked the mechanic, Ismail, about the car, he seemed unaware and uninformed. It felt like he had no knowledge at all. The car was delivered as if no work had been done, and it seemed that he hadn't even touched it. Today (July 17, 2023), when I called Tülay, she casually suggested, "Bring your car again and let's inspect it once more," as if I were just around the corner. I bought my car with great enthusiasm and trust in the Citroen brand. I have been a loyal customer, regularly visiting authorized service centers in Ankara and Istanbul. Now, I find myself helpless with my beloved car. The service employees shouldn't act as if they are doing me a favor by reluctantly performing their tasks. They should be solution-oriented and avoid capricious behavior. I have never encountered such behavior at the service centers in Istanbul or Ankara. These staff members must be warned and trained properly. I am not seeking any special treatment; I simply expect the necessary actions to be taken promptly and efficiently. Ultimately, I would like to ask Citroen headquarters: What should I do now, and which service center should I visit?