Where is my delivery?!

On the 10th July I got an sms saying my parcel will be delivered within 6 days. On the 13th I called the 0800 number and was told the parcel left Johannesburg and would be in durban that evening. On the 16th I called durban branch and spoke to a lady who didn't know where my parcel was and couldnt give me any information. I asked for a supervisor who was busy. I called back later and left a message with the reception for someone to call me back. A lady called me back and said my parcel will come before the end of the week. It is now the next week. So I call durban again today and everyone is busy. So I leave a message with reception for someone to call me back urgently. It's now after 21:00 and no one called. 13 days have now passed. Last year my parcel was delivered late, dirty, torn and damaged, I sent an email to which no one responded. Will my parcel arrive the same way? Where on earth is my parcel and when am I going to get it? Have you lost it? Or does Skynet not have the capabilities to deliver all the packages in time? If that is the case then unisa should rethink their courier. Skynet your customer service is lacking severely and I will not recommend you to anyone Ever!