The strange thing with exch[.]cd is that it is not listed in any WHOIS database:
Then, I read this on Wikipedia:
https://en.wikipedia.org/wiki/.cdUntil 2011, the registry was managed by nic.cd. It was then delegated to the Société Congolaise des Postes et Télécommunications (SCPT).
As far as I understand, this means that .CD domain names are not managed by the same government department of Congo, since 2011. The management has been transferred to "Office Congolais des Postes et Telecommunications".
Therefore, I think we should contact the people in here:
https://www.iana.org/domains/root/db/cd.html. Specifically, David KINSAKA NDUENGA and Maurice MUFUSI NTETE UBAKA.
To further illustrate it, if you visit "nic.cd", this is what it says at the bottom:
Please contact us by eMail (support AT nic.cd) to receive instructions on how to regain your Registrar access account.
Nothing to do with reports for phishing or any other support. It is basically abandoned since 2011.