I got the same email last night and called the 1-800 right away. Apparently no one knew what was going on so I got transferred 3 times and put on hold for 15 minutes. However, in the end of the 30-min call, someone finally reactivated my account. Maybe try calling around after 9pm so they are not that busy?! However, when I asked them what exactly happened to my account, they didn't seem to have an answer to that...

Anyways, good luck!