is the other website telling blatent lies? Or are they talking about perhaps a bad "intervention" with that company...
unless they are telling lies
(slander...and you have to prove the lies legally...)
I doubt you have any grounds...to go after them thru the ISP...
(look at all the sites that bash G and Y and M...)
I doubt very much if you can get their domain taken away...no matter what...
I'm no expert in legal matters..
(but I did stay at a Holiday Inn Express once....)
8-)