Pathetic and none responsive. Can't get an invoice out of Fedex to pay duties (that isn't even due)

What must one do to get a package delivered from you? I've been phoning, I've been emailing, I've been *****ing & moaning... All that I get is sweet little ******alls?

1) FedEx Shipment: *** - The parcel is in Cape Town, and apparently there is duties payable on it. I’ve been asking for almost the entire week for an invoice to pay said duties, and I am not receiving anything from FedEx. I would appreciate some assistance so that the duties can be paid, and the parcel be delivered ASAP. I need this urgently and the delay caused by FedEx in this regard is unnecessary; 2) Please refer to ***. This was delivered on 2020/08/04. Not even a month ago. It is -exactly- the same goods, from -exactly- the same company, to -exactly- the same recipient. Why was there no duties payable on THIS delivery, but there are duties payable on the pending delivery I am querying here?