Discovery insure doesn't care about the well-being of their customers

I had an accident in February and claimed from the insurance, everything went according to plan, I was offered a rental car as per my contract while my car was in for repairs, it came back and upon driving it I noticed that something is still not right with the suspension, I took the car to a Tyre and More outlet for inspection. I was shown the control arms that were damaged as result of the accident, I took pictures of the problems and also noticed that some of the belly covers that were meant to be changed were not changed, I took the matter up with the broker, after a period of nearly a month, I received a call on Friday from the panelbeater Amalgam auto informing me that Discovery insure has finally approved the rest of the repairs on the vehicle, so we booked an appointment for Monday the 22nd April, upon arrival at the panelbeater and after the general inspection I was told that the insurance approved only the ball joints and not the other control arms as expected, I was told that the car will be ready on Friday and that the insurance was informed to book me a rental car till Friday. When I told them about the control arms that needed to be replaced, I was told that the panelbeater will contact Discovery insure for approval and extention of the rental till Monday. The panelbeater said they will inform Discovery insure about this. I later called my broker to find out about the authorisation for the rental, I was told that Discovery insure says that the panelbeater is responsible and that they must provide me with a courtesy car. I went back to the panelbeater with this story and the panelbeater said they know nothing about having to provide a courtesy car, they said when they informed Discovery insure to extend my rental to Monday they were told that I have depleted my rental. I find it strange why I have to be punished for the incompetency of either the insurance for the delay with authorisation or that of the panelbeater in not finishing the work on time. As we speak, I dont have a car to drive. The panelbeater called me today informing me that Discovery insure is not responnding to their emails. I asked the panelbeater to copy me when communicating with Discovery insure today and I can confirm that they didn't respond to their email. Tomorrow is the third day and my car is still sitting idle at the panelbeater. I am very frustrated at the moment. I thought Discovery insure was different but it is clearly the same if not worse.