Awaiting Package

I have been waiting for my package since the 6th of Dec, paid my package clearance on the 7th and was suppose to receive my stuff on the 11 December 2017. Since then i have called, sent emails and still called to understand the nature of not receiving my goods, the only thing i keep getting is that i have to pay an extra amount to receive my stuff... how long should i wait for the invoice if the 1st time i used DHL i received my stuff in 4days now it has taken more than that and im fighting on receiving feedback. Why if you guys work with customers you cant keep them updated on their package... this is the last time im ever using this company to receive my international goods.