Poor Service and bad, arrogance customer service

My Colleague sent his car for major service last week, yesterday when we were driving home from work, when making a turn all of a sudden there was a hamming Noice as if something was broken underneath the car, we then drove to a nearest garage, open bonnet and my collogue reverse vehicle whilst we examine what could be wrong, only to find out the engine was hanging, showing it was not supported correctly, only to find out the bottom supporting mountain( arm was loose, bolt and nut has come out and fell whilst we were driving. went to Baron this morning, spoke service Supervisor, the guy could not even hear us out, the arrogance, his customer service is so terrible, not even to apologies of the incident. he claims the bolt and nut we picked us as prove might not be coming out of the same vehicle, yet we have image of the car underneath showing the mountain has no bolt and nut, no support for the engine. engine is only supported on the sides but not underneath, it not even a full week after major service, how did this happen?