If you got scammed, you need to contact your CC company/bank & report it. Most of them have a department that deals with scams/fraud. Read the sticky at the top of this page about membership, it's got some good advice.

Basic LW is free & you can get a clean version at
www.limewire.com

If you bought a scam version of pro, I don't like your chances of getting it back from the scammers! Official pro costs US$18.88 & gets you 6 months of updates & email support. You can get it at the link above.