I renewed my virus definitions service on 21 February 2003 and looking under Virus Definitions Service the second line entitled Subscription Service it shows the correct date (2004). Did you print a copy out at the time? This has the new expiration date on it. You could then produce this as proof. Try a manual update by clicking on LiveUpdate and see if that alters it? My service updated the virus definitions immediately after I had finished the renewal procedure.
All the best