Sorry to hear, I'm sure I will get banned, just hasn't happened yet, just checked 2 mins ago.same thing happened to me 12 hours ago. Just attempted to log in again 1 min ago and I'm officially banned. It's not a phishing email, you will be banned.
I read a thread in here where a guy received the ban email and didnt could still access his accounts for 2 weeks. I just had two of my accounts get banned last night and I can still access them. It looks like you will lose access if you ever log into battle.net, so DONT log-on to the website. I'm gonna see how long I can play with my banned accounts without logging into the website.