Regretably you have been scammed ... This is generally more of a problem involving Limewire than Bearshare. Limewire are not likely to respond to you. Simply because they only reply to bona fide Limewire pro customers only and even then, not always promptly. The Limewire portion of the forums seems to answer most peoples queries. They do not run a huge international help desk and do not employ vast numbers of people to answer inquiries. What has happenned to you is in no way connected with Limewire, and you have not even been "Sold" a current version of Limewire.
4.8.1 is a moderately old (6 months)version of Limewire (although, still regarded as a good version, but it is quite possible your version has been doctored and may contain spyware and other nasty goodies.
You should get onto your bank and cancell the payment. You have been a victim of fraud, and the bank should protect you against this. I also advise cancelling the card, as the scammers have your details and could do anything with them.
Please let us know who you purchased this through, and if possible the url of the original site you went to. Hopefully this will still be in your browser's history.
This link will explain the problem, from a Limewire perspective in painful detail, but From what you say, it sounds like you went to a similar site to many of those mentioned in this link,
http://www.gnutellaforums.com/showth...threadid=28751