Standard Bank huge disappointment with senior staff

I was sitting in the queue at Wonderpark at the tellers this morning with about 9 people. One customer was querying his bank balance at the teller and the supervisor was explaining his deductions. Frustration starts to build in the queue. Then she suggests he downloads the APP that will help him and she starts helping him. The teller is now trapped in this process and the customer struggles with this process. I was next and asked that she takes the matter to an open teller window so that the cashier can do her job and help me as we are all wasting time in queues and there is an enquirers desk. She gave me that look that can **** as she disapproves of me telling her what to do. With no emotion about 10 seconds later she says 'ok that's fine' and walks to the next teller. What is that???? NO customer service or common business sense from her or appreciation for us as customers spending our precious time in her badly managed queue and I felt the racial tension from her as I dare to tell her what to do. I cannot blame the customer but this is why people leave banks, because of the self righteousness of bank employees. Even the junior staff (tellers) have better manners!!