Worst service ever!

Midas centurion has proved again what horrible service can be, we bought shocks for our car at the branch, the day after the purchase we realized one of the parts was used after numerous fights with the staff they replaced the part. When we started replacing the shocks the last one needed to be done was the front right, upon opening the box we noticed we where supp**** with two left front shocks... Now we are at the point where we have no car, the old shock is damaged by removal so we cant put it back the car is standing open for all to see. Today we called the branch before 8, they said theyll get a shock for us theyll send a driver to jhb to pick it up, after numerous phone calls promising the driver is still on his way back from jhb with the shock now all of a sudden there is no shock and they cant find it???? What is this even? Now they refuse to return the wrongly supp**** shock so that we can get one from a different store, so please tell me where is the solution. I will be taking this complaint to all available platforms and will be lodging a complaint with the consumer protection act!