Cannot purchase bundles on Vodacom

I have been trying to purchase bundles. I reckon this is occurring because Vodacom removed the bundle. It should then not be an option. Everytime attempt results in a message stating that the bundle is not available. My contract data is not enough. I am wondering if I should bother with taking out another later in the year. Especially if I can't purchase data. Service therefore is poor and cost unreasonable.