PAYING 3X MORE FOR THE LITTLE HYUNDAI i10

My father bought me a car as a present two years ago, a Hyundai Grand i10. The problem here is the exorbitant installment of about R5000, now around R7000 due to 1 month arrears. We have been in contact with both Westbank and Hyundai SA for explanation but have been sent from pillar to post, no solution. We even tried to trade in the car at the same Hyundai Welkom dealership but without any progress. We are so fed up with this issue that its even bringing fights and intolerance in the house. Please help me out I'm stuck.