Mistake cost me thousands!!!

I drive a 94 Black Honda Ballade. On 19/04/2015 at 09H34 I went to refuel at Caltex in White River Cor. Tom Lowrence and Theo Kleinhans for the amount of R200. I was assisted by the attendant, ask to fuel up with unleaded, but did not check when he put fuel in. I drove home and smoke started coming out the exhaust. I drove the last bit of road home and got diesel a mechanic to check what's wrong. He could not find the fault and we replaced parts on the car that the mechanic thought was the problem. R2000 in replacing parts further I decided to replace the entire engine. I bought a recon engine for R9000 and had it replaced at a service centre in White River at a cost of R2000. When the mechanics at the service centre wanted to start the car with the new engine, there was still smoke coming out the exhaust. They check the fuel and found that there is diesel in the tank. The attendant had for some unknown reason put diesel in my petrol vehicle after I specifically asked for unleaded. We did not suspect that the fuel was the problem but the car as it is a 94 model. I email the branch manager (Leon) at Caltex WR but its been a week and he still did not reply with even an apology.