You should appeal as soon as possible after being declared undesirable. There is no specific time frame mentioned, but prompt action is recommended.

Generally, you are expected to leave South Africa and appeal from outside the country. However, specific circumstances might allow you to stay during the process.

Written representation explaining the reasons for overstaying.

A copy of the declaration of undesirability (Form 19) issued at the port of entry.

Copies of relevant passport pages, including the bio page.

Acknowledgment of receipt if you have applied for a permit and the status is pending.

Medical certificate if the overstay was due to medical reasons.