Bad Customer Care

I emailed Cell C on the 12.05.15 requesting for my contract to be cancelled at the end of its term as I was advised to contact them at this time by another consultant a few months ago. On Saturday morning at 09h28 I received a call from Cell C and the lady on the other side said she called to hear my query on my statement, I advised her that my query was to cancel contract and I attached statement as proof of number as these are data packages and I didn't know the numbers. She proceeded to authentic me and then moved to query then was about to wrap up the call when I asked when will services be terminated, she said 18th June didn't understand the reason as I was under the impression it ended in May. I then asked about last payment and she said I needed to pay for June then wanted to wrap up call again to which I expressed my dissatisfaction to paying in June and she was super eager to hang up. I asked her if she is not going to ensure I am satisfied, explain billing etc. to which she said there was nothing she could do. I was utterly unhappy and had planned to stay with the network on prepaid basis but after that service I think the other network providers might be better suited