This article provides you with steps to update your domain contact details. This is the information that could be publicly viewed on sites such as whois.com.
INFO: Domain contact information updates take up to 5 working days to take effect for .co.za domains. During this time you would not be able to make any other changes to the domain such as nameserver updates. For any other domain such as .com, you will receive a verification email to accept the changes made. If the information is not verified, the international registry will suspend the domain which will impact both emails and website.