Follow these procedures to receive free credit from MTN
Dial *550# from your mobile device.
Choose option 7. MTN Bonuses
Choose Option 99 More.
Choose Option 2: Redeem Points. [In the following pop-up window, you can select either MTN or Free Airtime.
To receive MTN’s Free Airtime deciding on Option 1 Airtime
Choose the airtime bundle that fits your point range. If I have 7000 points, for instance, I’ll choose Option 4 to get 2GHC in free airtime.
Verify to Get Free Airtime