Credit Card

I have a standing instruction to have the FULL amount owing every month deducted from my cheque account and this has been happening regularly until the 29th January when nothing was deducted. I waited in anticipation for the deduction to take place and when nothing was forthcoming by the 4th February, I queried it with my relationship banker and I subsequently made a manual payment on the same day. i was informed that no payment was deducted because a previous amount of R 26 400 was reversed during the preceding month and this was regarded by \the system"as payment. Then out of the blue on the 4th February"