On 3/15/2008 I recieved a e-mail message that my Norton Anti-Virus account had expired and I needed to contact them and re-new immediately or lose that protection. I followed directions and re-newed my account at that time, recieving an order number and assuming the transaction was completed. Three days later I turned on my laptop to find the same message again stating that my Norton Anti-Virus account was closed. I immediately went on-line to verify that I had renewed this account on 3/15/2008. I followed prompts to my previous order, however, I was promted to re-enter my credit card information. When I recieved my credit card statement(today), I had been billed twice for the Norton Anti-Virus product. One on 3/15/2008 and again on 3/18/2008. What must I do to address this double billing issue?