Disgusted by management of howard centre branch

I went to vodacom howard centre in pinelands cape town. Asked the consultant brittany to cancel my contract, she referred me to the manager as she did not know the process. She advised me theres absolutely nothing they can do i need to call the call centre. I did that but got no joy as i could not get through to anybody on the line. I then called the howard centre store again and spoke to brittany she wasnt aware of how to advise me and i asked for the manager whom i just spoke to while i was at the branch and she hesitantly came to the phone and said theres nothing more they can do without hearing me out. I asked her why she is shouting she said i am not listening to the instructions i asked if i can have her managers number she said she is the manager and theres no area manager or regional manager after i told her i just need assistance she shouted at brittany “please handle this i do not have time for this nonsense” i heard it loud and clear. Oh she also told me about franchise stores and owner stores who operate differently which i have no knowledge about. I want to know how vodacom can employ such a rude person with no managerial skills no customer service no empathy as a manager. I felt so inferior and vulnerable that such a big company portrays that image