Webroot review: automatic renew without my knowledge

I bought Webroot AntiVirus and AntiSpyware one year ago (8/19/09) should be good for 3 computers, then my old computer broken.
This year, when I purchased a new computer, I tried to install Webroot AntiVirus to my new computer (2nd computer) on July. I was denied. So that I did not want Webroot Anti-Virus any more. I got another AntiVirus for my new computer.
Lately I found a charge from Webroot Software for $49.95 (AntiVirus). It was Automatic Renew. But, I did not want it.

When I called, their recording phone said I should go online to get my refund. When I went to Webroot refund website, it said my invoice was over 30 days old. I was too late to ask for a refund. But, I did not know until now. They can check that I have never used the Key Code to install it on my any omputer yet. They knew I have never use it, why did not they give me a refund?! I was late because I have been moving from Sacramento to Sunnyvale, after my husband passed away (he trimed a tree and fell from a ladder, got brain injury, then brain death 4 weeks later). Please help me, Thank you.

My Webroot Software Invoice # RA00019139046, Amount $49.95.
Charged on my American Express on 8/13/09. (Due date: 10/06/09)

Grace M. Tung
home: [protected]
cell: [protected]