Over a month trying to upgrade with no success

I currently have a 15GB+15GB month-to-month SIM only contract and have been wanting to upgrade to a 30GB+30GB month-to-month.<br> <br> I app**** for this upgrade at Telkom Sandton City on 17-Nov with Order No. ***7A and was assisted by an agent called Thomas. After 2 weeks of calls to the store, call center and credit control. I was told that I had to submit more documents for credit checks and not just my passport as I'd initially been told. From then on, I've interacted with Musa, Haword and Carol from the Sandton City store and they've created numerous order numbers (***A, ***A & ***A) between 4-Dec and 12-Dec and numerous case numbers (***9 & ***3). With Musa, I even paid the reconnection fee of R150 on 4-Dec. So I don't know what the hold up is. I keep getting told that the system gives a save error because of a vetting error screen and that approval is being held up back office. <br> <br> Who do I need to shout at who can get this done. I never had this issue when I got the contract initially. But I'm glad it's a month-to-month as I'm considering cancelling altogether if this issue is not promptly resolved.