Unsuccessful closure of account

Car was bought through a car dealership and was sold back to the same dealership. The car dealership failed to pay the final settlement amount in time. Interest was added to the amount the next month. The installment was deducted from my banking account. I went to ABSA Newcastle to sort this out and contacted the Vehicle Finance Department. ABSA Vehicle Finance Dept refunded me and promised that the account will be closed which was never done. To date the same amount gets deducted from and paid to my account. This all started in November 2014 and has not yet been resolved.