Reluctant staff

According to SARS I have earned interest of thousands of rands at Nedbank while I don't have any investments at Nedbank. My book keeper told me on Monday, 16 October 2023 about this mistake. On Tuesday, 17 October, I went to the Paarl branch where I and a couple other clients had to waited for nearly an hour to be helped. The printout that I have from a screenshot was not of good quality and the staff member that helped me asked to bring a more readable copy. He promised to call me between 16h00 and 17h00 which he didn't do. Today, 19 October 2023 I walked into the branch before 09h30 and there was nobody at the entrance to give me a number. I simply walked in and took a place in the waiting area. The same staff member "helped" me by receiving the email with the information on his electronic device. He went to a lady at the back which is apparently the only one that can help me, but unfortunately she was busy in the safe. He promised to call me at 15h00, but again he didn't. I am not going to travel to the branch again, but I demand a written confirmation within 24 hours to SARS and me about the wrong information. As it is they have my confidential and private information and what will happen to it as this is how they treat a non-client.