MTN refusing to cancel upgrade

I received a call from MTN Corporate offering me an upgrade and I agreed on the 21st of September 2015. I was promised that the phone would be delivered within 2 days. About a week later, the phone had not been delivered. I called MTN Corporate ***) to enquire about the delivery. The sales consultant (Mpho Phenga) told me that they only dealt with Sales and not deliveries. I called again on the 2nd of October 2015 requesting that the upgrade be cancelled because of the false promises and bad service. I insisted that I be sent an email confirming that upgrade cancellation, which I did receive from the supervisor (Thandeka). I have received numerous reference numbers for my calls (MT***2, #1894), but the upgrade has not been cancelled and the phone was never delivered. To my surprise, I have been billed for the new contract since October 2015 - MTN 350 SUBS FEE R324.56, PROMO SERVICE FEE R402.63, BROADBAND 500MB R92.11. <br> Kindly advise me on what is going on about the upgrade cancellation. This has been a very frustrating experience.My claim reference numbers are MT***2, #1894