There's no life membership. Pro costs US$18.88 for 6 months of upgrades & email support. The only place to get the official versions of basic (free) & pro is
www.limewire.com
Read this for more info
http://www.gnutellaforums.com/showth...threadid=28751
Contact your bank/CC company & have the transaction cancelled. There should be a department that deals with scams/fraud. Maybe check with them, they might advise you to cancel your card.
Good luck