Hyundai Bayon Door Dropping Issue - Service Still Blames Me

In July 2024, I purchased a Hyundai Bayon disability-adapted vehicle from Kaynak Oto. Shortly after, I began experiencing issues with the driver-side door, which appeared to have dropped by about 1 cm. Since I was out of town, I brought the car to Kaynak Oto’s service department in its sixth month. When I explained the issue, the service manager claimed the door had dropped due to excessive weight being applied to it and that the problem was my fault. However, this assumption ignores a critical fact: this is a disability vehicle, and I am a woman who is 1.30 meters tall and weighs 34 kg. If I supposedly caused the door to drop by putting weight on it, why didn't any of the much heavier passengers sitting in the front passenger seat cause the same issue? After some disagreement with the service manager, they lifted the door and returned the car. Two days later—despite the car not being used regularly and mostly parked in front of my house—the door dropped again. I then took it to Hyundai Coşkunlar service. The same excuse was repeated. When I objected, they readjusted the door and assured me the issue was resolved. However, I had to return twice more to have the door lifted again. When the issue persisted, a staff member named Ö*** informed me that an investigation had begun, parts were being gathered from other Bayon vehicles, and that around 7–8 cars had similar problems. I was told a Hyundai engineer would come to measure the extent of the door drop. Although they claimed the drop was measured, the engineer never saw or spoke to me—only inspected the car itself. I waited for the results of this process and was finally contacted by headquarters on July 24, 2025. They asked what Coşkunlar had told me, and after I explained, they ended the call by saying the investigation was still ongoing. However, when I called headquarters today, I was told the investigation was concluded and that the door had dropped due to external factors related to usage. Now I ask: if a woman of 1.30 meters and 34 kg could supposedly cause the door to drop, why didn’t the larger individuals who used the other doors cause the same? My brother, who weighs 60 kg, even pulled on the passenger door in front of the service staff, and nothing happened. Clearly, the issue isn’t from pulling on the door but rather a factory defect. This is not the first time I’ve purchased a new vehicle—my husband and I have previously owned new Volkswagen, Peugeot, and Nissan cars without any such problems. It’s obvious this vehicle left the factory with a defect, and instead of taking responsibility, the service has been giving excuses to dismiss the issue.