Poor cuatomer service at Miway Insurance

I reported the accident on miway app and they did not respond for almost a week. I had to make a followup and on their next call, they told me that the have approved my claim and l must laise with Renew-it Randburg and areage when l can take my car there for fixing. They did not tell me what was appoved. I later learnt that they only approved the from bumber and did not aprove the rear bumper and the sensors. I am still struggling to get the approve the rear bumper. Furthermore, the car is back, poorly repaired with recycled old parts. Funny, they kept on telling me that the panelbeater is waiting for parts from Mercedes Benz. Does Mercedes Benz sell second-hand parts?Now they are sending me from pillar to post to fix their mess. They cant even call to advise on the wayforward. Their customer service is disgusting. They are not exposed to the ABCs of service failure management.