Impossible to upgrade or cancel any contract

It's now more than a year that I'm trying to upgrade ********** 423, which is long due for an upgrade. I was with a lady "Bianca" in the Bayside CellC Shop. She obtained a credit vetting for me, but with the amount which was approved by the credit vetting, the system rejected the upgrade due to the fact that I'm under debt management. What is the use then of getting a credit vetting with an approved amount, which I cannot use. She really tried everything to help me with the approved amount, but no one could explain to her why an amount was approved for an upgrade, but the system rejects the upgrade Now I've decided to cancel this contract, which I cannot upgrade, or do anything with, but this is now also a problem. Now the people who I'm trying to cancel the contract with, want to know why I don't want to upgrade it rather - and this is the point where I start to loose patience.

If this number can not be upgraded to a R279.00 deal, can someone please cancel the contract for me. If this can be upgraded please contact me via Bianca from the CellC store at Bayside Mall, in Tableview. She really tried her best to get this sorted out, but the system did not allow her to. Please DO NOT cancel any other number on my contracts - they are still in use (and also due for an upgrade).