Late/no delivery, rude call centre agents

I'm waiting for delivery of my study material from Unisa over six days now (since 22 July 2015). On Monday 26 July I inquired about my package at the Skynet call centre, at first they could not trace it and later I was told it'll be delivered on Tuesday 27 July. On Tuesday it didn't come and I called again and again on Wednesday and both days I was shunted from pillar to post by call centre agents. I complained to Unisa as well as to Skynet and no response yet. What infuriates me even more is that next week Friday 07 August my first assignment is due and I still don't have my study material! I'm extremely disgusted with the service of both Skynet and Unisa for the delay they are imposing to my studies.