Since we have received plenty requests about deleting the cases. So we tweaked the system that Clintel admins have access to the Cancelled button; and no longer needs a dev to do this. (This function is available from 6.78)
1. Go to Dashboard
2. Search for a patient and click show
3. Click case & programs on the left side panel
4. Click show on the case box
5. Click cancelled to delete this case (you need permissions to do that)