There are many reasons why your domain could be suspended on the server but not in ClientZone. The main reason is for spamming. Our automated system for suspending domains on the server only scans the server for spamming/bulk mailing, incorrect mail account authentication, weak passwords for email accounts, etc. Once the server picks up any of the mentioned issues and depending on the severity of the issue the server will suspend the domain to protect the rest of the users and the server. If a domain violates our terms of service and the AUP it will be taken down with immediate effect.
Hosting Terms: https://www.afrihost.com/site/page/terms_and_conditions/domain_and_hosting