If you have just purchased a Top-up but your internet hasn't started working yet, don't worry. Your phone simply needs to "refresh" its connection to the local tower to recognize the new data balance.
The 10-Second Fix:
-
Turn Airplane Mode ON for 10 seconds, then turn it OFF.
-
If that doesn't work, Restart your phone.
-
Once the phone reboots, it will ping the network and immediately see your new data allowance.