Complaint that parcel is stuck at Mail Centre

I am writing to express my disappointment in the Johannesburg International Mail Centre.

I sent a Christmas parcel from New Zealand on the 03 Dec 2017, I paid premium price for the delivery in 5 working days option. The parcel did arrive in SA but has since then been sitting at the international mail centre. My sister has been calling everyday but nobody is very helpful! The service is shocking. I am so upset to hear that my niece won't get her Christmas Present in time!

If anyone can assist me that would be great, but I am not feeling very confident

She will need the parcel latest on Thursday 21/12/2017 otherwise they leave for holiday and won't have in time for Christmas

She is happy to drive to the centre and collect herself to make the collection faster

Desperate and Unhappy!!!!!!!!!!!!