AFRINIC whois database is a public database which is open for anyone to use. If your person object (nic-hdl) is not protected then anybody can alter it. We advise you to create personal maintainer or use your organisation maintainer to protect your object.
Note: As from the 31st of August 2017, an individual auto-generated maintainer object was linked to all the unprotected person and role objects. The passwords were sent by e-mail to the email address(es) in the person/role object.