Turning Automatic Renewal off

I have had Norton 360 on my computer for a number of years.  I recently had a charge on my credit card for the automatic renewal.  I don't recall turning that on when I signed up, but it's possible.  However, when I went to the site to turn it off, it says "You do not have any product subscriptions currently enrolled in the Norton Automatic Renewal Service."  In the app it says I do.  I'm not sure how to turn it off.  Another weird thing: the credit card that was on file was out of date and expired.  How was Norton able to get my current credit card to charge it?