Overnight courier takes a week?

I paid for an overnight courier service for the shipping of a very important document to Pietermaritzburg from Pretoria at around 13:00 yesterday (13 March 2023) and I am writing this review on 15 March 2023 at 10:00 but as at close of business day the documents were not received by the recipient, What is a meaning of overnight if it takes more than 96 hours and the places are 6 hours drive apart?

The fact that I chose overnight instead of the normal courier service means the parcel had to be delivered urgently. Thank you for ruining my life at an extra cost even