I made this account a long time ago with the help of a now deceased family member. I have access to their email, but I have no idea what the security codes are.
The forums are not associated with Official Deca Support. Please submit a support ticket through the proper channels, as we can only formulate speculation on whether or not they will help you.
Security codes meaning security question answers, then yes, if you provide conclusive and definite proof that you own the account.