First, Blizzard sometimes spends some time tracking the account usage...in particular, Meth's account was used to filter lots of gold and mats on one server. If you have contacted Blizzard and they are taking their time with a response, they may be following the account activity.
Second, EVERYONE should link their account to a battlenet account. It is easy and if the promo is still in affect, you get a free battle bot pet. It adds more security.
What a huge pain, having your account hacked. We all have spent hours, I know, playing these toons. It is like losing contact with people you see nearly every day...
Good luck.