Cell C discriminating customers that are under debt review

I have been a client with Cell C for years and I am now due for upgrade. But as luck and circumstances had it I'm now under debt review, yet Cell C isnt part of the debt review - I have placed it as one of my monthly expenses which I pay monthly without fail. According to the debt review companies if you have placed it (your cellphone account) on your monthly expenses when you app**** for debt review, and you have proven that you can pay the account, then you are allowed to upgrade your contract, you are only not allowed to open a new contract. So, my question to you - why am I not allowed to upgrade? I did not ask to upgrade to the most expensive cellphone. I asked to upgrade within the same amount I've been paying, because I know I cant afford it, I'm not stupid. I know what I can afford and what not.... Please explain to me why you like to break the rules? You can see what I am able to pay each and every month when I pay my account - so why did you decline my upgrade for a 'simple' phone where I wont need to topup etc