ICANN is your next stop.
https://www.icann.org/resources/pages/abuse-2014-01-29-en
Edit: I did some digging because I was curious. Spaceship looks like a related company to Namecheap (perhaps even fully owned by them). Business records in Arizona for Spaceship, Inc have the founder and CEO of namecheap and namecheap itself named.


They have a contractual obligation to investigate and respond to abuse complaints. ICANN will punish them if they don’t.