Barons N1 City, avoid their contract ****s

I traded in a car and bought a new one, with two contracts, cancel the old one and start a new one, the new contract was around R20 000 short of my instalments/contributions, or total input. This is when the problems started, spoke to the accounts person who said they are confused but would get back to me, no reply, its has now got to the point where 6 or 7 Barons N1 City staff are involved, and all ignore my emails or stay they are unable to understand the contract, I took the effort to break down the contracts in a very easy to see approach, and the only reply I got from accounts at VW is that they are baffled, I could be paying R20 000 more for this car due to a contract issue, and there is no one at Barons N1 City who can assist, my numerous emails just go unanswered or I get referred to someone else, its a simple contract, why will no one speak to me