Terrible Service

I have been waiting 2 months for my device, because of Cell C mess up. So I decided to cancel the upgrade and order from MTN as they do have stock. I cancelled Friday 17 Sept and was told it would take 2 days and Then I MUST PHONE BACK. I did and was not cancelled. Phoned wednesday and it was not cancelled. Phoned today, 4.5 days later and guess what.... NOT CANCELLED. I was told by the customer service that NINA SKOSANA the supervisor will phone me back, I said I will give her 1 hour..... guess what.... NO PHONE CALL!!!. YOUR SERVICE SUCKS!!!!