Data not reflecting after being bought

I am struggling to buy data for another cell no - been trying since beginning of Jan and getting no explanation. 1. Airtime goes through fine from bank 2. Cannot buy data as rejected (NO EXPLANATION) 3. Buy via Vodacom off Credit Card and all looks fine but no data transferred. First call responded late and messed up the process. Second call could 'only tranfer data to airtime' and then I would need to transfer this to data (MESSY!!!!) Tried again yesterday and now going through the stupid process again. Different stories and seems like they are not able to check even their own Incoive (provided) that shows it has been processed. Agents trying but clearly have limited power and knowledge on the system.