Passing the buck - poor service!

Automagic Strydom Park was chosen by my insurance as the panel beaters to fix my car. They told me it would take 7 working days, which it did, however when I went to fetch my car, there was still a part missing ( bumper slide) which I was told would be delivered within that week. I fetched my car on a Tuesday and did not hear from Automagic that week. It is now two weeks later, I have called twice already, without any notifications from Automagic. Both times I had called, the blame was passed onto the company delivering the part and that the delay was from their side.

Initially I was very happy with Automagic, but have only received poor service since I've picked up my car.