Could you share how you reached to the conclusion that centralnic.com is behind nic.cd? I did report using that form, but I just want to know, because I could not find anything related.
Why do you report to a web hosting service? Is it related with the company "nic.cd", or do you suspect they sell web hosting services to exch[.]cd? I'm asking, because eXch Support wrote this:
Update: We have noticed some users sent abuse report to the hosting company. Please DO NOT send abuse requests to hosting companies.