Damage to my car after service

My car is out of its service plan, which means I don’t have to go to BMW anymore to service my car; however, I still make use of BMW services due to the trust I once had in BMW. Nonetheless, this was the worst service I had ever experienced in 10 years of driving a BMW. One would think the highly regarded BMW would provide better service, but this definitely was not the case. I took my car to them for a service and told them about a faulty part on my car. Collected my car after the service only to see they had not fixed the faulty part which they explicitly told me they had fixed. I had to take my car back to the dealership twice to get it fixed after that, which also incurred significant additional expenses as they then told me they had to order new parts. During this process they also damaged my car, leaving scratches on my car in the area where they worked along with patches where the paint was completely off. At first they denied that it was them but then agreed to have it fixed at a panel beater. It took another 6 weeks of back and forth to get them to actually fix the damage on my car, during which they also had to twice drive my car to a panel beater in Somerset West on my expense. In the end they paid for the damage and fixed it, but it was by far the worst service I had ever received. I definitely would not recommend taking a vehicle there for a service.