Pathetic service and no feedback

Terrible service regarding a query about an upgrade on my contract. Sales person (Sipho) advised he will call me back in 3 to 4 minutes as he was having computer problems. I provided 2 cell numbers. That was at 9.56am. I then received an and saying my payment details have been changed as requested. I did not request any change. No feedback received. I called them back at 11am and spoke to Sipho again. He was rude and provided terrible service when I asked no feedback was received. When I enquires about the and he says he didn't do it and the customer services uses another system. He was extremely rude. I asked for the manager whom I was told was in a meeting. Sipho tells me he also has to be in the meeting but he's busy talking to me. His manager (Tani) was supposed to call me back after her meeting. 3 hours later and no feedback yet again.