No schedule followed - Poor communication

DHL gave me the option of when I would like these packages delivered, which I thought was nice at first, however I realise that DHL does not adhere to the times that I selected. Additionally, after changing the date of one of my deliveries to a sooner date I was informed that DHL did not implement the request, so a manual request had to be put in to be delivered (later than when I had initially asked for it to be delivered). However the tracking on the website does not reflect a date and the package has still not been delivered in spite of the manual request for a delivery on a certain date.