Poor Workmanship on Car

Claimed for an accident two years ago. They sent my car to a panel beater over 90km to where I stay, and the accident was around 20km from my house. My front left indicator never worked from the time I received my car, which I took up with the panel beaters to no avail. When complaining to MiWay, we contacted the panel beaters again and they said they would let me know when they receive the part. Its been over two years now and when I bring it up with MiWay they say they can no longer assist. The mechanic I took it now to as part of the cars service said the panel beaters put in aftermarket headlights and that is why the globe is not working. After receiving the car from the panel beater , I took it for a service and they said the same thing, that a non-Renault part was used. I did respond to the panel beaters of this, which I have forwarded to the Insurance. And now two years later, the same issue which they are not willing to resolve.