One of my friends has been hacked

Hi,
One of my friends has been hacked his battle tag is/was Frosto08-1726. The people have taken his account and changed the email making it impossible for him to login or even change his password. His account email was rorkob08@hotmail.com . He has no 2fa or anything but he still has emails from when his account was changed can anyone help him.
Ace

I too have the same issue , my account been hacked and email been changed , any way to recover my account ?