It is not possible to merge the progress of two or more games into one.
Instructions on linking your MLG and Blizzard accounts
Information regarding the legality of sharing an account.
Steps for linking a Third Party Platform's account to your Battle.net Account.
Recovering a Battle.net Account when the email address has been forgotten
Information about how progress tracks for separate accounts on the same platform
Information about the processing time for ELV/Direct Debit/Sepa payments.
What to do if the name on your account is "Adventurer"
How to permanently delete an account.