Postnet polokwane failing to deliver a parcel and is 10 days now.

I have send my parcel from postnet burgersfort on the 27 October choosing overnight coriour service , From monday the 31 i started phoning them asking when will my parcel be delivered .tuesday i phoned again, wednesday i phoned agai,thursday i phoned again and to day if friday i can see my parcel still is not out for delivery. I asked them yesterday we both can see that they cannot render a servise that i paid them to do they rather give back my money and my parcel, they told me my query has been escated. i did not want to escate the query i wanted my parcel to be delivered.