No one picks up calls at customer care

My parcel left the UK 26 October 2015. I see on the tracking system it's been sitting at the international mail centre since 20 Nov 2015. I have been calling the call centre everyday since the 27 Nov 2015 trying to find out where my parcel is and I have had no luck. I eventually got through today and I was advised to send an email to [Email Removed] and give them my name, address and contact details. I sent three email and they all failed. I am frustrated because it will take me another 7 days before someone at customer care picks up my call and I urgently need my package. I am even willing to drive to the international mail centre to pick it up myself but I am not sure if I can do that and where the JHB international mail centre is. I would appreciate anyone who can help me with this.