I don't think I signed up for automatic renewal. I found someone saying that's an "option" they added but it wasn't listed and you were automatically signed up for it. They even said you had to contact Norton to get it removed. They updated not long ago saying they added the removal process online. I turned off auto renewal and deleted my billing info.
Norton, by default, has that option checked when you sign up. You have to actually make it a point to NOT auto renew when installing and subscribing.