Appaling customer service

On the 27th of September 2023 I called African bank and the I my call went through to Tshiananne Thavhana and the service I received was horrible. All I wanted was the to close my credit card and send me my paid up letter. She told me she sent me a push message and I didn't receive it and I was told that it's because I am using a dual sim phone I'm gonna have to disconnect one sim. I explained why I cannot do that and she told me I need to go to the branch. I explained to her that I have called African bank before and I have never had this problem. I ask to speak to the manager and she told me the manager is too busy to take my call. I'm very disappointed with her problem solving skills. African bank is a very big company to hire such *********** people, both Tshiananne and her manager need to go back to training and learn customer service.