Unpleasant Customer Experience

On the 14th of June 2018, I paid over 40K towards my vehicle finance account and was informed that I can decide to either get the installments reduced or term reduced. I then decided that the installments be reduced and arrangements were made via the call centre. On the 22nd of October 2018, I received a call from ABSA Collections informing me that my account is in arrears of R2 641.42 (July). Of which I was advised that this would be provision and the balance from the amount paid in June would be capitalized. I called the call centre and no one was keen to assist me, let alone provide me with a proper solution. They were quick to answer without understanding the nature of the situation. One of the consultants even kept quite after I requested for a solution, instead of a story and was oblivious to the matter at hand.I need urgent response to this as this is not my fault, that the arrangement was NOT done from ABSA's side.