Cannot buy data bundles

I have a main cell number and a data number. In the past I could log in specify the data number and buy an additional once-off data bundle. In fact the previous record is visible. Now - when I want to buy more data - I am being told that I am not the main account holder and cannot buy data by adding it to the account. This is definitely a mistake/error on the system as I am the main account holder and I have bought a data bundle like this before.<br> <br> After a week of endless calls and useless explanations - and call center agents logging the wrong faults and IT brushing this off by only sending an SMS - I am at my whits end with Vodacom. Can I please get service now??? If you are at liberty to just increase contract fees then you have an obligation to provide proper service as well. Or it may be a good idea to take both contracts elsewhere I think.