There are very strict rules for bringing an interdict which state that you must:
Sometimes you get an interdict but the other party just ignores it. Then you can take further legal action against the other side. You can get your attorney to go back to court and ask the court to lock up the other party for refusing to obey the interdict. The other party is in contempt of court.
Interdicts are not necessarily a lasting solution to a problem. For example, a farmworker may get an interdict to prevent a farmer from unlawfully evicting him. But the farmer can then just get a court order, allowing him or her to evict the farmworker lawfully.
But interdicts can be useful by publicly exposing unlawful actions by people. Interdicts also give you some time in which to decide what you are going to do.
In this time you might be able to negotiate with the other side about a settlement that will suit both sides.
Interdicts cost a lot of money to bring to court. If you lose the case you might have to pay for the other side’s costs.