You were scammed
LW basic is free, FW is free too. LW Pro costs $18.88 USD which covers you for 6 months of updates & email support.
The only official site for LW is www.limewire.com

If you buy from any other site, you risk being ripped off & possibly downloading a version of LW with spy/adware. Have a look through the 2 threads below...the first has general info/scam sites etc & the second has some info about how users have been able to get a refund from scam sites

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

You should contact your bank/CC company & ask them to cancel the transaction! They probably have a department to deal with scams/fraud.