Vodacom really makes business difficult for us

I have previously purchased top-up data using the simple \MyVodacom"app. My tablet data has nearly run out so I tried to buy a 500mb data bundle for R79.00. The app however now only offers \""convert airtime to data\"" but when proceeding it states \""add to my bill\"" (which is what I wanted to do). That failed to work. Stupid app... new version is a step backward. So I used the web and that gave me two options"