Bad service and wrong updates

Hi It's Kwena

I have a bad experience with Motor Accident Group my car was taken to them by budget insurance 6 weeks ago and they told me it will take it will take 15 days for the repairs to be done and they will update me with the progress, now 15 working days has passed ,no updates and when I call they told me the car is ready for collection but they want to verify some other things,later they told me the car is still waiting for parts to be delivered it is not ready yet ,so it shows that I won't get it anytime soon. Please help