Neglectful Nedbank

I took out a credit card with Nedbank, last week Monday 27/07/2022 I tried to call to cancel but with every approve it message the call would disconnect and until Thursday no one bothered to call me back. The card has now accumulated interest which puzzles me, I went to the woodmead branch and the host was rude and told me I should just call as it only him 5 minutes to close his credit card, he further told me that I can just sit there and wait for an hour if I’m insistent for a consultant to tell me the same thing. I called once again shortly after that interaction and was told that my query was only submitted on Friday and the admin team had yet to even pick up my query ref number ***0. I don’t think it’s fair for me to fight to get service and get billed after requesting closure