How do I buy prepaid airtime in the app?

[StandardBank]

Hi ZolileZwane, 

When did you purchase your airtime? 

[ZolileZwane]

Hi, I bought about R60 MTN airtime, the app loaded for some time before telling me to check my transaction history to see if the purchase was successful. The purchase appears but I still haven't received my airtime as yet and I'm tired waiting. Please help