Hayes Motors POOR Service

I took my 1993 Isuzu Trooper V6 , it started, but the brakes and handbrakes did not work. I bought brake pads for my van at Hayes parts dept and asked them if i could bring in my van for the repairs. I brought it in with a car trailer and drove it from the trailer into their workshop. I knew it had a lot of rust undercarriage, and their mechanic also pointed it out. They told me to come fetch my van and the costs was double what i budgeted for. When i drove the van home , i was`nt satisfied with the results, because the brakes and handbrakes hardly work. I went to tell them about this, and they said i must bring it back. I drove the van to their workshop in Stikland. After a week they asked me to fetch my van. Arriving at the workshop, they told me the van cannot start. The mechanic said it can be low fuel pressure, and i knew my fuel pipes could be contaminated with rust. I asked them to see if they can get my van started, and left it there. After a week they asked me to come fetch my van because they could`nt get it started. I had to rent a bakkie and trailer to fetch my van. They did`nt even offered me assistance to help get the van to my place. I stay less than 5km from their workshop in Kuilsriver. I am not a mechanic, but i took off the fuel tank , cleaned it, bought a new fuel pump and sender unit , and fitted it. Still NO Start. I checked for spark and fitted 6 new spark plugs. The Van started instantly. My problem is . they are Isuzu specialists. How could their main mechanic not find the fault for the NO Start. I posted this on social media and i got a lot of response from people who had the same poor service deal from this company. Like some one posted , look like they never touched my vehicle. They just cranked and cranked the motor and i ask them not to mess up my starter. I am going to pursue this bad service vigorously, also approaching Small claims court.