Customer Service / Retentions Department

I was contacted on the 25th of August to upgrade my existing contract. Sounded like a great deal and the CSR was very professional and helpful. This is where the good service stopped. I called MTN after 10 working days to follow up on my I-Pad I got pushed from pillar to post and was told the device was scheduled for delivery. Another week passed with no update. Called MTN to cancel the upgrade. Got a REF # ********** 4 on the 18th of September to confirm the upgrade reversal. Called on the 19th to check if the upgrade was cancelled and was told by Torey in your retentions department that she would check with the warehouse to see if the device had been returned by the courier. Torey promised to call me back on Tuesday - which never happened!!!!. Called the retentions department again on the 22nd of September and spoke to Denesha who spoke to Torey and once again a call back was promised - at 13:00 I called once again as there was still no call back. Got told by the Call Centre that the Retentions department closed at 12:00 today. Almost a month later and this is still not resolved. My contract expired at the end of August but I have been billed for the New Upgrade for a Device that I do not have !!!!!!!!!!!!