I had something similar happen to me a few weeks ago. I received an email, supposedly from Blizzard, saying that they had reason to believe that I was trying to sell my World of Warcraft account and they needed me to give them my info yo verify the account or it would be permanently suspended. I've never played WOW in my life and I don't have an account. I figured it was someone fishing for my info and ignored it.
I get all kinds of WoW emails
all the time on my secondary / spam email account. Someone tried to sign up for an account in my name, my WoW account's been compromised, my Battle.net account's been compromised, etc. etc. etc. Three issues with that: 1) I don't have a WoW account, 2) I don't have a Battle.net account, and 3) if you examine the headers and the links they want you to click on, the emails aren't actually coming from Blizzard.
So, yeah. They're phishing emails. I get them occasionally from phishers after my equally non-existent eBay account, too.