Poor workmanship

Poor and substandared service that almost costed my life. Renew -it. Sandton called me to come and collect my car after it has been in their facility for almost 3moths with a light accident that was also hyper inflated in costs. The car was said to have passed the Quality assurance check and i was shocked to learn that there were lots of obvious Errors on my car which included: 1.wrong colour shade, 2.misaligned affected body parts, 3.the Badges of the vehicle found discolored, 4.The sport badges on the affected side was not placed back after fixing. 6. Seal cover not Clipped back properly back to the car 7. No engine cover beneath the vehicle after repairing the suspension and most cables were left hanging, 8. Most rubbers were left dismantled which when i was driving there were disturbing Sounds worse especially when acceleration. 9.the Bolts/nuts for the L rear wheel were never put back, i was made to drive a car with a wheel that was not tightened with bolts which eventually caused another accident on N1 just after collecting my car on the next day while i was returning the car for them to have a further check up. 10. Spray Washer bottle for the wippers not repaired. 11. The engine rubbers and covers not resored after dealing with the engine parts. 12. No test drive was done after repairs especially after tempering with the suspension, the car was pulling one side while driving and no wheel alignments done. In short, there has been a poor workmanship and i do not feel safe to use the car anymore especially that they are fixing it again. I do not trust them and i am scared i do not know what to do. My car will not be the same again and fact that some components may not be obviously seen especially on the engine part for a BMW, ti already can prefict reccurent costs of repairs soon after their 2nd poor workmanship. One can agree, once experienced an accident, you will never be the same, so i feel traumatized and scared. They borrowed a loan car which i was denied before the 2nd accident and above all that, they just said sorry. Please advise what can i do and who should i consult for help?