Worst place to take your car for repairs

My car has been to Bosch Service Centre Silver Lakes 3 times now to fix the problems caused by fuel contamination. Going against what Mercedes suggests, they did not replace anything. My car then broke down with me, my wife and baby. So I took it back a second time, where they then replaced the 2 diesel pumps (something Mercedes suggested they do in the first place) They also scratched my car in 3 places. Then after I got my car back it started leaking diesel. So I had to take it back a third time. Now have have to take it back again for the 4th time because of exactly the same reason. I have now been without my car for about 3 months. I am not exaggerating when I say that this is the most useless bunch of people I have ever had to deal with and I will never suggest Bosch Service Centre to anyone. In fact, I will warn everyone I know, to never take their car to Bosch Service Centre.