Verye I must agree with him, I had separate IP's and said that I was hacked when I got banned, and they said, hold on let me quote please.
"Please review the World of Warcraft Terms of Use at
WoW -> Legal -> Terms of Use which states in Section 6. [Security of Login Information] “You are responsible for maintaining the confidentiality of your Login Information, and you will be responsible for all uses of your Login Information, whether or not authorized by you.” Please bear in mind that you are also responsible for any prohibited software found to be running in conjunction with World of Warcraft while your account is logged in, regardless of location and ownership of the computer used to log in to the service."
Is basically what they said to me. As well as:
"Additionally, Section 1 [Eligibility] states that only you and/or your one (1) minor child can access your account. You are responsible for maintaining the confidentiality of your Password, and you will be responsible for all uses of your Password, whether or not authorized by you. Also, note that the security of the Account is your responsibility."