dishonesty by staff members

on the 4th of february i took in my toyota fortuner for a 30 000 km service.my car is still under motor plan but on collection i was told to pay R350 because they cleaned the dust form the brakes.I paid as requested by when i got home it dount on me that i should'nt have been charged since the car is still on motor plan.Worse the guy who charged me took the cash and he did'nt even give me a receipt.Anyway i let it go not knowing that the worse was yet to come.On the 27th of March i wanted to use the Navigator on the car sumthing that i hardly use since i bought the car 2 years ago.To my suprise the screen showed me an error msg which i didnt understand but i thought that may be it needed a softwear upgrade.Then i called melrose toyota to book the car in for them to check what was wrong.I had a shock of my life when they checked the car and said the Navigation memory card was missing.I have no doubt in my mind that the memory card was ****** by the staff of melrose toyota when i took in the car for service.I know need to spend R1500 to buy a new navigation card.I will never ever take my car to Melrose toyota ever again.