Midrand Grand Central Motors (Mercedes) a danger to society

What a terrible experience I continue to have a Grand Central Mercedes Benz in Midrand. This time it happens after 2.5yrs of boycotting them from past numerous bad services experienced but just on return boom. Collected my car from a service last night and today morning I drive it to work, the car to work and it packs up and stops in the middle of the road. Diesel was leaking so badly on the road. On opening the bonnet, I found that the pipe to the diesel filter was not fastened and petrol was just pouring out like a fountain.

This was definitely negligence from the mechanic who serviced my car. S/he didn't tighten this pipe. Thank God it was a Diesel car, should it have been a petrol car it would have ignited. The quality of mechanics at Grand Central Mercedes is so bad, service too is terrible. I doubt they are poised for doing any vehicle service, they will kill people if not already.