You'd be better off saying this to whoever scammed you

LW basic's free. Pro costs $18.88 USD & includes 6 months of free updates & email support. There is no lifetime membership.
The only official site for downloading either version is www.limewire.com

You should call your bank/CC company & report this ASAP.

Have a read through the 2 threads below. Page 5 of the first thread has a list of scam sites! The second thread has info about how some people have been able to get refunds from scammers.

http://www.gnutellaforums.com/open-discussion-topics/28751-membership-warning-beware-download-p2p-clients-only-thru-official-sites.html

http://www.gnutellaforums.com/open-discussion-topics/44499-get-your-back-music-members.html