my car not fixed properly by Secunda Panelbeaters

My car was at Secunda Panelbeaters for repairs, when I got the car back from the panelbeaters it was leaking dust in the boot. I took the car back to the panelbeaters and told them its leaking dust in the boot and which it didn't before the repairs, I left my car with them to fix and then at close business same day they told me its fixed. I drove my car for a few days then the dust came back then I brought back the car back and left it with them to get it fixed again. I got it back from them close of business the same day and they told me it was rubbers that where flipped the wrong way. I drove it for a few days and the dust is back again.