Misleading Promo

VodaPay has a 70% promo for 18GB, 30Days data bundle.

I proceeded to go buy R170.00 worth of airtime using my linked bank card to buy the promo.

When attempting to buy the promo, it is then when you realize that the promo can only be purchased using a linked Bank card or Wallet.

The promo does not specify that it can only be purchased using the linked bank card directly, which is what I used to purchase the airtime in any case.

Would I have not have done that from the get go if it was clearly indicated?

Please rectify this matter urgently.