Absences are getting auto approved automatically for vacation rules instead of Reject

Employee has created a absence and submitted, it goes to his supervisor for approval and its get time out and then goes to next level supervisor who has a vacation rule in place , so the notification is transferred to the delegated approver and its get again time out and leave notification has got auto approved. but client request is at any point of time auto approval should not be done , it has to be rejected at the final approver.