Wrongful delivery & no urgency to deliver parcel

Good day. My books from unisa was delivered wrongfully to Durban. It has cost me money trying to find out where they are. Now they are finally in Cape Town and now no one knows where my books are. But on Friday 30 January the lady at the Cape Town Branch told me that the books would be delivered to me over the weekend to my home address, which also never happened. This morning I was on the phone again for 20 minutes trying to find out where my books are, just to hear that they are not sure and they will have to go and investigate? This is the worse service I have every received from a courier company. How do you get the address so wrong between Cape Town and Durban?!? and to loose the package once it gets to Cape Town. I want to know where my books are and when they will be delivered. It was a simple thing to deliver. Very disappointed in the service from Skynet Express. I phoned Head Office to log a complaint, only to be placed on hold until the phone went dead.