So, if I understand you correctly, you want to use carrier billing as your payment method? And you could do so with Vodacom, but you cannot with CellC? As such, you need to talk to CellC...not all carriers allow billing of BBWorld purchases through them.
Special through 31-Oct-2015 -- 10% Discount at ShopBlackBerry.com! Click here for details.
Occam's Razor nearly always applies when troubleshooting technology issues!
New to the Community? click here and also here. Please click here for helpful information to guide you as you proceed. I always recommend that you treat your BlackBerry like any other computing device, including using a regular backup schedule...click here for an article with instructions. If anyone has been helpful to you, please show your appreciation by clicking the button.