Should have reregistered it with NSI then, and then transferred it to register.com. If you were so petty as to not to want to spend $30 or whatever to safeguard "years of work" then it is all your fault.
Of course, if NSI were refusing to transfer your domain, then sue them, because ICANN say that you should be allowed to tranfsfer a domain between registries, even for a charge.
You refused to pay the rent, you got thrown out and somebody else moved in. Bad luck, better luck next time. Why not get another domain name, it might not have been as good, but that is what marketing exists for - to market your domain. People don't just turn up at your site for nothing!
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