Sorry, but you definitely got ripped off. You can commiserate with all the others here.
** BEWARE** - Download p2p Clients ONLY Thru Official Sites
You can download Limewire from the official site here:
http://www.limewire.com/english/content/download.shtml
Basic is free, Pro costs $18.88US and gets you 6 months free updates and Pro support.
It's also advisable to contact your c.c. company and let them know you were scammed, they may be able to help you. And you can try to contact the site you purchased LW from and demand your money back.
Also keep an eye on your c.c. statements as they like to tack on charges for other things you didn't sign up for.
Good luck
.