transfer of parcel

my parcel has stayed more than one month in Johannesburg International Mail Centre (JIMC) in Airport Area, Kempton Park and nobody answer me what the reason of it is?<br> Item summary<br> Tracking number Origin Destination Status<br> CA***IR IRAN, ISLAMIC REPUBLIC OF SOUTH AFRICA On route<br> <br> Activity summary<br> Local date/time Activity Location Remarks<br> 9/3/2015 10:01 AM Posting/Collection IRZ14 <br> 9/5/2015 7:50 AM Arrival at outward office of exchange TEHRAN A <br> 9/6/2015 12:14 PM Departure from outward office of exchange TEHRAN A <br> 9/13/2015 12:13 AM Arrival at inward office of exchange JIMC C <br> 9/13/2015 12:13 AM Held by customs