Poor Service

My name is Victoria Leyds, my vehicle is financed through Wesbank. I have been a client of theirs for many years and has never experienced any problems. I made arrangements with the company to change my debit order due date from the 20th monthly to the 1st of every month. I have not defaulted but instead of honoring the debit order, I am paying a cash amount into the following account that was provided to me by one of the companies consultants which is FNB account ********** 6566 branch code 250655 with my reference number ********** 0854. I have made 2 payments on 31 August 2018 and 1 October 2018 of R2400.00 and R2650.00 respectively. According to my statement from the service provider the outstanding balance shows two different amounts. I have send a query through to client services querying the difference as the status of my account is not under collection. To date I have not received a response and shall be pleased if I can be provided with clarification.