I’m not sure if you are still around, Stelly, as you or your friend with the closed account, but I have an update.
From what we’ve been able to tell the account does appear that it could have been compromised, including the email address associated with the account.
My advice is to secure your email address or provide a new address that we can use to update the Battle.net account. When submitting a ticket you’ll want to attach another ID (the previous documentation automatically deletes to abide by privacy and personal information laws).