Absa Bank deducted extra amount on my car installment

Absa bank deducted an extra amount of R1 915.54 on top of my normal car installment for this month, I was paying R7 473.88 as a normal installment but this month you deducted R9 389.42. I have been paying my installments in full and i did not miss any payment. I have never received any communication about this from Absa Bank before this deduction was made and i was surprised to see such amount being deducted on my account.