Oil leak caused by neglegency of technicians

Good day<br> I will start of by complimenting MBSA for the efforts they make to help us Mercedes Benz customers whenever we have problems. I think they are doing a great work.<br> I sent my car to Mercedes Benz Umhlanga on the 09/12/2015 for a B5 service. My service adviser was Tracy. The service was done well I think. My complaint is that I took the care away thinking everything is fine and drove off. On 24 December I discover that my car is leaking oil, it was around 8 pm evening. I called MBSA and they sent a technician to check what was wrong with my car. When they arrived they could not figure out what was wrong or where the oil leak was coming from. They suggested we take the car to the workshop at Mercedes Benz Durban. I comp**** with the instruction. When I arrived there they took the car up the ramp to check and they could not find the source of the leak. They dropped the car and the discovered that the car oil cap was not closed. So I was driving a car with unclosed oil cap. That means the technician who did the work did not close the oil cap on completion of the work (service).<br> The silly mistakes that was made by technician on my car cost my time my car and the Mercedes Benz