Additional Payment Captured Incorrectly

So disappointed with the service I received from Wesbank recently! After being a customer for about 10 years I can honestly say I will not use them to finance my vehicles going forward or encourage anyone to use them. Over the last 3 months I have made about 6 additional payments towards my Capital Balance as Capital Reduction payments. With each payment I email the proof of as well as the instruction for it to be captured as a Capital Reduction payment to the Wesbank consultant appointed to me. Out of the 6 payments only 1 was captured as a Capital Reduction payment and the rest as Advance payments. After numerous attempts to get hold of said consultant he apologized for not following my instructions, however unfortunately the mistake could not be rectified as it is an automated system. In other words the response from Wesbank whom is at fault is simply "Oops, sorry, but you will have to deal with it.." I have now missed out on interest savings that I should have had, but according to Wesbank it can not be rectified.

I find their excuses for the incident to be absolutely unacceptable. How is it that corrections can not be made on a man made system, especially when the bank made the mistake in the first place!!