DHL Misaligned processes. FIX

My brother in USA paid $446 (R6 448.58) to send items worth $342.50 (R4 952.10) to South Africa. He was told to give ROUGH ESTIMATION by DHL Orlando, when the items arrived in SA the DHL Customs requested the list of the items and exact amounts PLUS proof of payment. I don't understand how misalignment between the DHL SA and DHL IN OTHER countries. WHY ARE YOU NOT ADVISING DHL IN OTHER COUNTRIES TO ENSURE CUSTOMERS HAVE GIVEN THE LIST, AMOUNTS AND PROOF OF PAYMENT BEFORE SENDING STUFF? My brother had to go through his bank account transactions, AMAZON account in order to retrieve the invoices since he purchased some items sometime last year. I mean he would have given the right amounts (NOT ESTIMATION AS HE WAS ADVISED) and he was not going to send items which have no invoices if DHL Orlando was aware of this process.

After so many phone calls and emails, I was finally given import duty/Tax payment of R 3 338.76 which I paid yesterday (15/09/2021) and I expected my parcel to be out for delivery. INSTEAD I get message this morning (16/09/2021) saying the parcel is delayed. Port health has backlog.

WE PAID DHL ORLANDO R6 448.58 + SA Customs R3 338.76

TOTAL = R9 787,34 for items worth R4 952.10 YET we are still struggling to get our items?