Account compromised? (with Authenticator)

I woke up this morning and had 4 emails in my Inbox. The first two were Password Reset notifications and the following two were emails that said the following :

Account Action: 72 Hour Suspension
Reason for Action: Terms of Use Violation -- Exploitative Activity: Abuse of the Economy



I tried logging in my account, entered the authenticator details and it said invalid login details. I tried this a couple of times. I then clicked on the Password Reset link on the Battle Net page, entered the secret question and answer and it let me change the password. I think tried logging in with this password, and the authenticator details and low and behold, it let me in.
However, clicking on those two accounts said they defnately had a 72 hour Ban. I do however, have three accounts attached to that Battle net account and i could still login with the other account with no issues.

I do not sell gold nor abuse the economy in any way. My accounts are squeaky clean as far as I am concerned and noone has access to this account.

Something has gone astray here. Authenticator's are supposed to protect the account, aren't they?!

Would appreciate some input into this from Blizzard.