Inefficient service

On the 5th of October, i was went into a Standard Bank brunch in Port Shepstone to settle my credit card. I was given a settlement amount by the consultant and paid it off. A month later i get a statement indicating that an amount of R900 is still owing. I called the Standard Bank inquiry number and was told that i needed to call in and get a settlement amount and that what i paid was just what was the balance brought forward. Firstly, How is it that the consultants working at the bank are not fami**** with this protol, secondly why complicate things by having to call in? Why is it not possible for a consultant who works in the bank to give me a settlement account, thirdly how did the interest accumulate to R900 in one month. Talk about inefficient services. I have been with standard bank from the time i was at University and i am completely not impressed with the service i received. This has been the 3rd or 4th time. I am completely furious, yet again Standard Bank does not deliver nor are they efficient.