Vehicle ruined during cam-belt service

I took the car for a cam-belt service & they ruined other parts instead. The car was making a strange sound, oil was leaking, the water bottle & other parts were hanging loose, plug lids were broken and eventually the car stopped starting all together. I had to have it towed back to them at my cost. They took days on end to attend to the car & since I use it for business purposes, I lost clients and money as a result. They were not bothered at all. The dealer principle is aware that they do not fix the cars properly & I sent him pictures of the damage caused. When I contacted the head office the call centre agent Natalie Mostert refused to let me escalate to the customer service manager & she shouted at me & eventually dropped the phone as I was speaking. The cambelt service is still under warranty so they are obligated to fix the car properly. Since I have had so many problems with their ********* business practices I cannot tolerate dealing with them anymore. There's no corrective action or accountability from h/office or the dealer so clearly this is common practice. Do you do this to ALL your clients or just \female"clients because we are not mechanics? """