BAD SERVICE

I had an incident on 19/07/2018. My car was sent to the accessor on 23/07/2018. Not to be too long up until today I haven't received my car back. They took the car to another panel beater that has poor service like them. They had to order a part at Germany and when it came car was taken to the dealer for the part to be replaced on 22 /08/2018. The dealer found out that there is additional work that needs to be done and they need authorization from the insurance. Today is 28/08/2018 the dealer is still waiting for the authorization. How long is it going to take just to do that. I don't have a car more than a month now and they don't care,but when it comes to debiting my money they do it on time and without fail. I just fail to understand how do they sleep at night when they give such a bad service to their loyal customers