Please help

I need some help please. The below parcel, I am told, is stuck in Durmail/customs. The person I spoke to at the call centre advised that customs needs the invoice confirming the contents, but how do I do so? I tried calling the Durmail office in Greyville and cannot reach them? what can I do?

Item Number: RF ********** 65SG was last scanned on: 2018/03/29 at 14:07 Location last scanned: DURMAIL (HUB) Currently has status of: In transit TRACKING LINE TYPE DATE TIME BRANCH COMMENTS 1 In transit 2018/03/29 14:07 DURMAIL (HUB) 2 In transit 2018/03/26 12:18 DURMAIL (HUB) 3 Incomming International 2018/03/20 09:11 JHB INT MAIL CENTRE (HUB)