Worse GM in SA for ISUZU

I bought new ISUZU KB 250 latest double cap in December,i supposed to re-sign the contract cause they made errors with the amount on the contract and i was the one who pick it up . The permit of the car expired on the 31st of December and i have to just drive after it expired until the second week of JAN.The car had a problem with the left rear door and fuel cap since i bought it till to date.I've already took it to them 4 times to fix but they failed decently.How can i keep on fixing the new car?thus very irritating and disgusting cause the car is brand new.They are wasting my time and fuel to drive to them every now and then without joy.Now i gave them last chance to fix the car or i will cancel the contract .This is bad cause i bought 2 cars from that garage in december and i deserv respect. No body even cares to take this matter serious.My sales consultant was Lebo and she is no longer even interested to sort this mess out ,she said i must escalate this issues my self.What she was interested on was to sell me the cars and get profit and now she is showing me her true colors and middle finger.F*ck the garage and HOPE PEOPLE MUST TAKE THIS SERIOUS AND BOYCOT THE GARAGE.