Vodacom app useless to purchase data for my ipad

This goes to inform you that I think the Vodacom app is useless when trying to purchase data for my iPad . I am supposed to be able to purchase airtime or data for any of my linked accounts, but it does not work. Vodacom makes it difficult for their loyal contract customers to stay with them due to apps not working!<br> <br> Regards,<br> <br> <br> Georgia