Unavble to buy daya

I submitted a complaint to Vodacom on 15 October that although the number I want to buy additional data for is reflected on my profile, their system says that I am not the main account holder and will not allow the purchase transaction of additional data bundle to process. I have also tried to purchase a data bundle using FNB on-line but the transaction will not process there either. I received a call from Vodacom on 16th to say that the matter was in hand and the system would be changed to allow me to purchase within 2 - 3 working days.<br> A week later and I now have less than 2MB of data. I have now sent THREE emails to Vodacom and have told them any 'out-of-bundle' excess charges are THEIR responsibility and not to bill me for them.