Confusing / Illogical Credit Card function

Standard Bank seems to make the most simplest of transactions overly complicated and confusing. The logic of which I fail to understand. On the 5'th of December I withdrew an amount from my credit card, 5 days later I transferred the amount I withdrew back to my credit card. You would think it makes it a simple debit and credit solution, what I take I give back, a simple cancelling out is required. NO, according to their consultants an IMPOSSIBLE task, something that just CANNOT be done. The amount I paid back gets allocated automatically to all the plans, fine, but your telling me that you cannot manually allocate the amount to cancel out what makes logical sense, you telling me I have no control over what plans I want to pay on my credit card, I call bull. Get you act together Standard Bank. Maybe it's time for me to look for another bank, I have left others for far less.