Charges in my account

I decide to check the status of my Nedbank account which, to my suprise I see charges of R 8.50 that were charged 3 times on the 10th Of January and 4 times on the 11the of January, I went to the branch in Protea Glen mall and everyone there could not explain to me what were those charges for, I then called the call centre an the lady that I spoke to kept asking me if I had used my card to check balance at an ABSA ATM, I said to her why would I go to the ATM if I have the banking App, she kept contradicting herself because she did not want to be accountable, I then spoke to Babalwa Matshinye at the branch, first she said the charges are for checking balance on the app, I asked her, why am I not getting charged R8.50 infront of her using the app, she then said maybe my card is clonned and the only thing she can help with is to change the card, I said I do not want a new card instead I want to close the account and I want to know what is going to happen with the charges that they cannot explain, she said they cannot reverse that charges because the manager is not in on the day, she then asked me to call the call centre again and the centre sent me back to the branch people, it was a back and forth type of situation, not pleasant at all, I would like someone who can explain these charges and aasist me close that account.