Bad Customer service

Today at the Preller Square Branch where I usually go to do the banking of our company I was waiting in the line for the Bulk teller, as no one was in front of me and the rest of the queue was standing in line for the one open teller I was the first person to go to the Bulk teller as soon as the person in front of me are finished with their business. As they walk out and it is my turn I go in to do my business, the next moment the guy in front of the other queue came barging in and accuses me of jumping the line. Now all of a sudden the teller is changing his story that the queue for the bulk teller is the same as the one for the normal tellers. Really frustrated I go and wait in the line of the normal tellers just so that the floor manager can come and tell me that I must stand in front of the bulk teller (the same place I stood at the very beginning) and wait for the one in front of me(the person who accused me of jumping the line) to finish there then I can go. They are very disorganized and don't communicate with each other as to what is what there. I am very disappointed in the whole situation and how Nedbank handled it. After I grieved about it at the floor manager another lady came just to say "sorry for the inconvenience" and went on with their business.