I want to close my account

I called today to close my account, I spoke to Emmanual in Customer service department ( ref ********** 02253) who has absolutely no telephone etiquette, he spoke while I was speaking, and did not give me a change. I had to tell him to listen to me each time!! I don't know what kind of straat mates you employ at RCS that has no manners. So I settled my account on 4 April 2018 an amount of R1806. Which was my balance before I made the payment. And as I had asked Emmanuel what my balance was after you people deducted my installment of R139, he confirmed that the balance was R1805.9. Which is the amount that I had paid. How is it that interest of R22 was charged on my account after I had paid off the balance? He's words were "interest are charged on a daily basis" and I asked how so if the balance is RO? I asked for a manager but he said there were no managers available which is absolutely ridiculous. I asked him to close my account and he refused to. I want that account closed today!!