Poor Customer Service

My car was involved in an accident beginning of September. I put in a claim and waited a week or so for my claim to be approved. My vehicle was taken an hour and 20 minutes away from my residence to get fixed. The panel beaters kept postponing my collection with no valid reason and finally, when I go fed up after 2 weeks of postponement I collected my car with it not completely fixed. There was an ABS warning light that kept appearing on my dashboard and when I told the mechanics they said they would send someone to my house to remove/clear the error. This did not happen again I called and followed up for this to get sorted. They collected my car and again the turnaround time kept changing and two weeks later I went to fetch my car and still, it was not fixed. Fast forward 2 months have passed and nothing has been done. I am constantly following up and calling and emailing and it is EXTREMELY frustrating for me as this shouldn't be how things are done.