Negligence - vehicle finance premium

I chose Standard Bank for my vehicle finance but only received efficient service until my contract was signed. I was also pushed to add the top up proposals, which I declined numerous times. <br> <br> Once I took delivery of the vehicle, all was good but the dealership had made a mistake with the year model of the vehicle which had to be corrected on the agreement. The amended agreement which was sent to me had a different premium amount, followed by 3 other amendments, incorrectly amounted. How can these amounts keep changing with no explanation? Also, when I queried this, I was not given the correct information or explanation for this but rather disregarded. I still have not been assisted with regards to this. I was given a contact number for the team leader (Elmarie Anthony) but no answer on both numbers & NO response to my email. Phoning the call centre is useless because no one is able to assist me.<br> <br> I feel hopeless, Im NOT paying more than what was initially agreed upon. The first premium is due for the 24 July 2015, time is running out! I would appreciate it if this can be dealt with by some one in an authoritative position who can help me clarify my agreement & premium amount.