Incase you don,t know, Me2U code is a private 4 digit security pin number that an MTN Client needs to enter in order to be able to transfer airtime credit to another MTN phone number.
If you or anybody enters a wrong match to your Me2U code several times, your Me2U code will be barred and you will be unable to transfer/send airtime credit. This is a security measure put in place by MTN to prevent somebody from illegally transfering (stealing) your airtime credit.
So if you noticed that your Me2U code has been barred, know that somebody attempted to steal your available airtime credit and MTN had to block your Me2U transfer code to prevent that person from eventually guessing your Me2U code.
If your Me2U code has been barred, just go to your nearest MTN office and an MTN agent will reset your Me2U code and you will be able to start transfering airtime credit again. The MTN agent will reset your pin code within 15 minutes and you won,t be asked to pay for the service. So run to your nearest MTN office now and reset your Me2U code.