Three days to courier an envelope 30 kilometres!

My service of Aramex has been nothing short of disgraceful... I dropped a legal statement (to be couriered to a lawyer in Durban) at Hillcrest Checkers early on Tuesday Morning. This distance is about 20-30 kilometres delivery. I tried to track the envelope as it did not arrive and I could not get any joy from the tracking number either, I went on line on their site and they told me the number did not exist so I photographed it and send it and they promised to investigate, I heard NOTHING, I then emailed and they promised to investigate I heard NOTHING.... Not even the courtesy of a reply...Finally on Friday the envelope gets delivered ????