Standard Bank

How is this possible. I have taken out an Access Loan from Standard Bank. I called in on the 22nd of September asking for a settlement amount got it and bank the funds. I was then asked to go into the bank to close the account which i have done on the 27th of September, i have received a reference number and though all is good 1 more account closed. After a week or so i called in to confirm and the account was still open. I went to the banker again (Zevenwacht Mall) and sit with the Prestige Banker to find out that the account is still open. Another hour spend at the bank and the banker told me that the request again was send and i should get feedback on the 25th of October. Last week i called again and still the account is not closed and i am still waiting for feedback. Last week i went to the bank again and stand in a line for almost an hour and a half and done another request. Today i called in again to follow up and guest what the account is still not closed. I am still paying for a loan that have a zero balance and the excuse it that it is interest. How can you pay more than R1 000 on a zero balance loan that was suppose to be close in September 2018.