You've not yet purchased Minecraft on that account.
You've purchased Minecraft, but on another Mojang or Minecraft account.
Your purchase has been refunded. If this is the case, you would have received an email.
Scenario: You've been logging in with email address as normal, but now can only access the demo mode.
Solution: Has the account been refunded? If so, an email would have been sent to the registered email address, and you can visit minecraft.net/store to re-purchase. Are you logging in with the correct email address? You may have registered more than one Mojang account, so try another email address that you own. It's also possible that the email address on the account has changed, and a new Mojang account was registered with the same email. If you believe that is the case, contact customer support.
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