Peugeot 508 Factory Defect

I recently purchased a brand-new Peugeot 508, but shortly after driving it, I discovered that it had a manufacturing flaw that required me to get a new part. I finally got my car back after waiting for months in the service center, but the problems I was having continued as soon as I got behind the wheel. I don't feel supported either financially or emotionally, and I've been abandoned. All efforts to get in touch with the responsible parties have been in vain. My car is broken down, and I have no other options. Please address and find a solution to this problem as soon as possible; it is causing a great deal of stress.