Dramatized
Legend
Well to start I assume he would have to know at least Sneaky's full name, date of birth, country of origin, phone number, address and likely credit/debit card number. Blizzard's phone security isn't so lax that someone can call in and be like "HEY LOL IM FIRST NAME LAST NAME PLS RESET MY PASSWORD LOL HERE'S A DOCUMENT TO BACK IT UP".
That being said, I'm tracking down the guy that did it. I have enough information on the guy to legitimize Sneaky's claims against him.
I was hacked, all I had to do was to answer my secret question and send in a picture of my id.