It looks that way yes. There's no lifetime membership to Limewire (LW.) The Basic version if free. So they were having you pay just to show you to the downld site which does not belong to them. Nor does LW itself have any relationship with those people. It's a new enterprise for people to put together attractive sites saying downld all you want & just pay a membership. Then show you to the free downld site. (By the way there's also a clone or few of LW that aren't as good.)

If I were you I would contact the credit company ASAP & cancel the transaction & explain these people were scammers.

This is the official LW download site: http://www.limewire.com/english/content/download.shtml (& downld.com or another site actually host the files.)