If you experience an issue while redeeming your card:
If you get a message that lets you know the card has already been redeemed, visit account.mojang.com/me to see if it was redeemed on your own account.
If you receive the error "This PIN code is invalid", please contact customer support with a picture of your card's PIN and the receipt from the card's purchase, and we will investigate further.
If you have entered a prepaid PIN at http://account.mojang.com/redeem exactly as it appears on the card and it does not work, or if you have received an error stating that we are currently unable to redeem prepaid cards, or that an error has occurred, please try again in an hour or two to rule out a temporary server outage. If you continue to be unable to redeem your card, please return it to the store that you purchased it from and ask their customer service to activate the card.
If you have a question that was not answered above, please feel free to contact customer support with your ten digit PIN and a description of your issue.