Engen garage doornplaza east

I went to engen garage doornport plaza east on 30th March on my way to take my kids to durban.i poured a full tank did tyres and put water and oil.i travelled up to germiston and car overheated and engine seized,BECAUSE THE WATER WAS NOT PUT AND THE CAP OF THE BOTTLE NOT CLOSED.I had to be towed back to pretoria.my car engine is damaged and the owners of this garage refuses to fix my car,they keep giving me details of their insurance and say just talk to them.the owners are Chris and Vuyo Hani,very arrogant people.if you go to this garage go there at yr own risk,you could get ye engine damaged