Vodacom/ Vodapay Misleading - increased bill - International Roaming

Vodacom/ Vodapay is misleading when buying roaming bundles on the app. I activated my roaming and selected the buy option on the app under international roaming, the deals displayed is apparently not the travel data packages and this resulted in a huge bill. The inconvenience while on business and on my costs I had to phone Vodacom/ Vodapay - sent from pillar to post as no one could explain or assist. I demand that a snr contacts me to get this matter resolved as I don't feel its fair towards any customer to be mislead by packages if loaded in the wrong spot on the app.