You can report exch[.]cd and try to persuade the registrar to shut it down. The other sites are offline.

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Here are some other email addresses that we can use to get in touch with the people responsible for .cd domains, including exch[.]cd:
dnsadmin@nic.cd, david.k@ocpt.cd, maurice.mufusi@scpt.cd, info@scpt.cd, info@ocpt.cd