Missing Items

I used their PostNet to PostNet courier service and my parcel is updated as sent but all the other evidence from the store it is meant to arrive at proves that the parcel is not present nor has it been delivered as mentioned (cameras checked by staff as well). I am not being helped sufficiently as I am not looking for a refund on the delivery as the parcel is valuable and is also damaging my business' reputation as I use the courier service for business purposes. A refund of R99 for delivery is not acceptable when there is no clarity on what happened to my missing parcel.