Switched My Parcel!!!

Last week Wednesday (3rd June) I needed to get some urgent documents to australia for a visa. I went to Postnet in sandton city and they assured me the easiest, quickest and safest way to send documents abroad was to use their connection with DHL fast mail. So I paid R670 for my documents to be sent. They assured me it would take 2-3 days for delivery. 4 days later (Sunday) I received a call from a stranger informing me my documents had arrived at a school in Swaziland. The DHL envelope they arrived in had the details of a scholar who had sent her documents to Swaziland. She also used Postnet in sandton. I immediately contacted DHL who informed me that Postnet had swopped my documents and another clients documents and ours had been sent to each others addresses. When I contacted sandton city Postnet the lady told me to call back on Monday when a manger was around and then put the phone down on me. Lovely phone manners. Now (Tuesday 9th June) almost a week later I have been calling Postnet and DHL daily to follow up on my documents, and guess what- they still have not been collected at the incorrect address in Swaziland and have thus not been sent to australia. Unacceptable service.