Rude consultants

I settled my account today and I called to close the credit card, was assisted by a rue consultant by the name of "Ncamisa" or something like that. I asked her if the account will accumulate any charges since my payment hasn't reflected yet and she said she doesn't know. how possible is that? When I asked to speak to someone else that can assist, she just put me on hold for 15 minutes before I hung up. The app is reflecting a R0.00 balance and i just wanted to know if they will charge admin fees until the payment reflects on their side and what I can do to prevent additional charges on the account.