Discovery holding my car ransom

I had a minor accident. I reported this to Discovery and made a booking with their panelbeaters Carworld for July 13. Later that day, I spoke to their customer services representative, Yueshan David, and said I wanted to use an alternative panelbeater. I told him I had a provisional booking with Car World, and he said he would sort it out. The next day, at 11.54 am I reminded him of the provisional booking with Car World, and said I would likely use Egoli. He sent me a disclaimer, which I mailed back to him. Egoli completed repairs of my vehicle by 3 July. On 3 July Yushan informed me that Carworld had ordered parts to repair my vehicle. I told him he had promised to cancel the booking. Later he asked if Egoli would purchase the parts from Carworld. I said the repairs were already done. On 6 July I called Yueshan to find out why payment was not completed. After a two day run-around with numerous promises of responses, I was informed I was liable for the parts. I spoke to Bianca his manager on 7 July to complain about communication and requested daily updates. I have still not heard from her. My car has been sitting repaired for a week at the panelbeaters. Outrageous.