BAD SERVICE - MERCEDES BENZ CENTURY CITY

On the 12.02.19 I dropped my husband's car @ Mercedez Benz Century City, I was promised to be picked up when the car was done & @ 14:20 I received a call informing me that the car was going to be kept longer and nothing was said about me being picked up as promised. My husband contacted them telling them we were in need of a car and he was told that only when the part is available overseas he'll qualify for a courtesy car. We've been stranded for almost a week, and this morning got a call from Monica informing us that the part is only available in Germany and the car will be kept much longer. We've been without a car for a week and the part is in Germany and we they are only informing us after a week, we have children to transport and also we are working. How are we suppose to survive with this poor service. This is Mercedes Benz and we are getting this service. I also spoke to the lady by the name of Gerbrecht who told me that that was a policy there is nothing they can do they can only wait for Mercedes Benz South Africa. The part is in Germany! Last week they said only if the part is overseas they will offer a courtesy car. I just got a call from Monica telling me that the part will arrive between Wed/Thurs. This is really bad, we must use public transport while we are paying big instalments for Mercedes Benz. How can we be inconvenienced for almost 2 weeks. Are these people playing games with us. Please assit