In-app top-up purchase false advertising - does not state that it is voda-to-voda only until after youve paid for it !

In Feb 2024, I had to do a top-up. I used the Vodacom app because of some technicality I can't use my bank apps. I purchased a R80 100 minutes airtime top-up. On the screen where one chooses the value, it only says its valid for 30 days. Only AFTER you've bought and paid for this, does it state that it is only for calls to Vodacom. I had to buy another top-up. I have screenshots to show the above. I have been to a Vodashop and called customer service twice, and each time they say that I will be reimbursed, but it never happens. This is false advertising or worse. FRUSTRATING. They know one will eventually forget so they just do nothing. But why not (PLEASE!?) state on the app this limitation before one pays for it ??????????