I'm not seeing StarCraft II or Diablo III ever having been added to the Battle.net account you're posting from. Could you email me the two keys you used and I'll see where they're applied? I suspect they're simply on another account you used before but aren't using now.
My email address is Omrakos.Support@Blizzard.com
_________________________________________________________ I'm available in the forums Monday - Friday, 12 pm - 8 pm Pacific Time Please provide feedback! - https://www.surveymonkey.com/s/Omrakos
The Battle.net account you're posting from doesn't seem to have ever had a retail license for Diablo III attached to it.
You'll need to submit a support ticket or call in/web chat as there are no other methods you can use for assistance for this sort of issue. We're unable to help here in a public forum as personal info has to be exchanged to establish ownership.
You should try using the Get Help section on the right side of this page to get started.