Concurred
It depends on whether the vehicle was purchased from Mercedes-Benz; if so, I would not decline it if the car is otherwise in excellent condition, such as being unblemished, having enough tire tread and brake life, not having been smoked in or exposed to pets, and possessing the appropriate specifications and colour.
If you exchanged your automobile for another used vehicle, it may possess additional issues. I would recommend giving them an opportunity; if the vehicle is equipped with Mobilo, contact them for diagnosis and repair. They can also schedule an appointment for you, as I experienced firsthand. My vehicle had a NOx issue, and they arranged for a loaner car, an E-Class, while my GLE was serviced. They resolved everything within three days.