In credit with Cell C but still refusing upgrade

I went to Cell C the Glen a week and a half ago for my contract upgrade. The new contract I am interested in is half the price of what I am currently paying. The consultant informed me that there is an outstanding amount, which I paid then and there( so currently I am in credit with Cell C but they are still refusing the contract) because it was weekend he told me the payment take 2-3 working days to reflect, they are VERY EAGER TO TAKE YOUR MONEY BUT VERY SLOW TO PROVIDE A SERVICE!!!!. After 4 working days I phone to check the progress then the same consultant told me he is waiting for the vetting department to load the credit score so he can process the contract, but he escalated the matter.

After another 2 days I phone again, and it is the same story, so I told him I will contact the vetting department myself as this is getting ridiculous, but had no luck, the worst part of it all is that this was suppose to be a Christmas gift which obviously did not happen!!!!! So today I phoned again and a different consultant informs me the contract has been declined!!!!! So My response was for what reason !?! So she tells me Cell C requires 3 months of debit orders before they can process the contract! My response was that I am a paying customer for the last 14 years with cell c and NEVER HAS THIS HAPPENED !!! What load of bull**** is this all of a sudden? Previous years when Upgraded I walked out the store that very same day with my upgrade! Then she has the audacity to ask me did he not inform me of this and then I blew my gasket and said if he informed me why would I be calling the store every second day?? So I am really disgusted with Cell C , as there was no correspondence from their side whatsoever, as I had to phone them sometimes up to 6 times on one day!! So head office needs to sort this out ASAP as I am taking my contract elsewhere, to people who can actually assist me!!!

Am DISGUSTED AND EXTREMELY DISAPPOINTED THIS IS THE WORST SERVICE I HAD IN A VERY LONG TIME!!!