Unreliable service provider

I am most unhappy with the service I am getting from one of Miway's service provider. I had a car accident on the 25th of June 2015. I called miway the following day and send through all document they needed for my claim by the 30th June 2015 Miway allocated the service provider to fix my car. Olympus Panel beaters. I was told that this service provider will contact me soon to make payment arrangements for the excess.I never got a call from them, so I decided to call them on the 3rd July to find out if they have my car in their workshop and to make an arrangement to pay in the excess required. I spoke Marius who told me they have ordered the parts for my car and I will pay the excess amount when I come to collect the car. He could not tell me how long it will take to fix the car based on the they did not have the parts yet, which is understandable. I called back on the 10th July and gave Marius my reg no. he told me they are doing the paint job on the car and I should get my car on Wednesday the 15th July. I just called Marius now and he is telling me he is still awaiting parts for my car and I might get my car next week Thursday. I am now left without a car, and no answers. help