Link to the EULA which contains the answer to this question.

How to delete your Activision account

How to swap email addresses between two accounts

What to do if you receive this error when attempting to add your phone number to your Battle.net Account.

What to do if your Activision account has been compromised.

This game account is in a different region or Battle.net account.

This game account is in a different region or Battle.net account.

This game account is in a different region or Battle.net account.

Information on error BLZBNTBNA00000A9C

How the silence penalties work