Frustrating Experience with Vodacom & VodaPay - Lack of Control & Poor Support from Vodacom

I'm frustrated with Vodacom's customer service and the VodaPay app. This morning, I called for assistance because when I try to buy voice minutes, I’m only presented with extremely high-end options—like 4,500 minutes for 30 days, 6,000 minutes for 30 days, or even unlimited minutes. I asked the agents why I’m not seeing lower options, and they told me the app randomly selects offers, and they have no control over it. Seriously?! I then asked if there was someone who could check my profile in case something was wrong, but they said they have no control over that either and don’t know why the system is offering such high amounts.