no shipment invoice sent

on Monday the 15th April I got a call from UPS for pre clearance of my shipment coming in from China..I gave them all my details they requested ,a lady by the namd of Kagiso said and invoice will be sent to my email and till today I still don't have an invoice..I tracked the shipment online and it shows that they are in the country at the Warehouse... All i need is someone who can assist me with an invoice so i pay the shipment. This causes a delay for delivery if we as their customers are not informed of anything in advance...I have been a client for a while now and this is a first for me.

my shipment number is: 1ZX2W ********** 238039