Terrible Customer Service from MTN

I received a phone call on the 05.05.2018 from the MTN Rewardsko Sales department to upgrade by contract. Agreed to the upgrade, but on viewing the device decided against the upgrade and informed MTN on 08.05.2018 to cancel the Upgrade. I spoke to a consultant named Phumelela who confirmed that she had sent through the cancellation request and that the cancellation would be effected within 5 working days. Subsequent follow up phone call to MTN on the 16.05.2018 to confirm said cancellation of the Upgrade, only to be informed that the cancellation has not been done. After speaking to 2 agents and then directed to the Retention's department, advised by a consultant named Donovan that I had to call the Rewardsko Sales directly to reverse the cancellation even though they are part of MTN, it was now my responsibility to call them to reverse to Upgrade even though I never received the new phone for the Upgrade. After numerous attempts to speak to someone at Rewardsko, and holding on forever, I eventually got through to a consultant, only for her to drop my call and not even bother to call me back. How a company like MTN can provide such shocking service to its customers is beyond me and shows utter contempt towards the consumer. The service that I have received thus far from MTN has been abysmal to say the least.