Detained Gift/Parcel

My sister in law (from Poland) sent me a parcel, of which is now detained at the Jhb international mail hub. When I call the PO customer service, I was told I need to send an invoice. Now this is not something that I purchased. How am I supposed to have an invoice???? Anyway, I contact my sister in law, and she went back where she purchased the item and a invoice was given to her. I then emailed this to [Email Removed] as well as [Email Removed] but NO response. The status of my parcel (RI***ZA) is still as follows:<br> <br> Currently has status of: In transit<br> TRACKING<br> LINE TYPE DATE TIME BRANCH COMMENTS<br> 1 In transit 2015/10/27 09:08 JHB INT MAIL CENTRE (HUB) <br> 2 In transit 2015/10/15 10:47 JHB INT MAIL CENTRE (HUB) <br> 3 Detention Notice 2015/10/14 11:29 JHB INT MAIL CENTRE (HUB) <br> 4 To Customs 2015/10/14 03:32 JHB INT MAIL CENTRE (HUB) <br> 5 Incoming International 2015/10/10 10:31 JHB INT MAIL CENTRE (HUB)<br> <br> Now I don't know what must happen because I have sent the invoice and NO RESPONSE! And my parcel is still detained!!! This is frustrating and pathetic!!!!