Misleading

Bought a car from Kia Hatfield, the policy was sold to me incorrectly the F & I specialist Mpho Ikageng sold my policy incorrectly which now the dealership doesn't want to amend the policy, Nela from Liquid Capital worked out a quote that I have to pay the difference if I want to continue with their services hence the dealership doesn't want to amend the contract. As I want my car to have a service plan I opted for payment plan Nela from Liquid Capital said no arrangements can be made the money must be paid in full. My car is currently on 728....kilos which according to the contract they is sold incorrectly state that I already did the 90 ....kilos service.I hope and believe am the only victim from this dealership