Vehicle not fixed properly

Last week, on 5 March, my vehicle got stuck and was taken to BMW West Rand for repairs by BMW assist. It had a drive train light on, and when I was told to collect it as the repairs were complete, the battery had been changed and the throttle as well. I collected the vehicle on 7 March as they called me saying it was ready. Barely a week later, the same problem occured while I was driving alone on the freeway at night - such a risk for me. How can a vehicle have the same problem twice. Meanwhile, the vehicle had been for a service with them less than a month before the incident. These people are gambling with our lives on the road by not ensuring that our vehicles are fixed properly before they tell us to collect. Two opportunities to ensure that the vehicle is good and they just chose to be negligent and still claim the money from the warranty. Poor service, and lack of care and service excellence for customers. They are placing our lives at risk by not carrying out their jobs diligently. I am appalled and so angry at my time wasted.