Incorrect Debit Amount

<p>Mid April, i changed my debit order date for my vehicle finance instalment from 25th to end of the month. Which was successfully done. Only difference is that at the end of the month, I was debited the residual value (R20 000) which is only due in 2019 at the end of my finance agreement instead of my usual value of R2 7000 - R2 900. This caused an unpaid debt and a charge on my account which needs to be reversed since there werent enough funds to cover this. I queried this and i was told its "probably" a mistake and it will be investigated. Of course this happened again now 30 May. Instead of my usual instalment amount, i was debited the residual value of R20k again.</p>