The official site is http://www.limewire.com/english/content/home.shtml
And no they don't have an accesible telephone number. They don't have sufficient numbers of staff to be manning a telephone 24 hours a day for either sales or support. If you have a legitimate question, you can ask limenathan (click on link)

As far as searches go, LW has never had the ability to save them in between sessions. I'm not sure the beta can either.

However, you can try to browse people with the same or similar files. If they have more, then make a note of their ip & try to direct connect to them next time. Else, search for files you know they have.