Maemo Motors Service Failure, Poor Workmanship, and additional costs

My car was in for repairs and service at Maemo Motors booked Feb 16th and released Tuesday 17th. I had to return it on Monday 24th after having difficulty starting and a leak that was supposed to be fixed during repairs. In the afternoon they called to say the car has been fixed and I can come collect, hardly 10km from dealership the car lost power, and completely shut down. The car has been with them since, and they want to do additional work on the car of which they want me to bear the costs. They haven't responded as to whether the issue of the car shutting down and replacing a worn out belt that they should have replaced during initial repairs has been done. At this moment I'm without a car and I don't know the status of the vehicle that once was reliable and released to me after service and repairs. During this period I received limited updates of which I had to follow up multiple times. I'm without a car that I use daily. . The core issue is the repeated mechanical failures, safety risks, and breakdowns that occurred immediately after the vehicle was released, despite assurances that repairs had been completed and the vehicle was safe to drive. The crux of my concern is that:-• Major safety critical failures occurred immediately after repairs and release. • A fuel/diesel leak reappeared after being confirmed as repaired; • The vehicle became unsafe and unreliable only after the repairs, whereas prior to the work it was still drivable.