This is what has happened to me:
I did not realize that when I bought my Norton Antivirus online last year for my netbook (I gave that one away to a family member)
they had an auto-renewal option attached to it.
Despite the company not even sending me an e-mail for it, I found out it was automatically renewed and I had to suffer because my credit card got charged for something I did not intend to purchase, and Norton would not even provide me with a refund after that.
I wonder what kind of customer service this is.