very frustrating dealing with FedEx

We are waiting for an urgent shipment. FedEx decided to guess what the shipping code should be and wanted me to sign their incorrect clearing instructions for customs. I was initially told that they cannot change the shipping code until the shipment has been cleared. Makes no sense to then chage it. After my refusal to sign for incorrect information, FedEx had no option but to declare their mistake to customs and receive a R 1500 fine from customs. This is, however just delaying the clearing process further. Been waiting for this now for almost three weeks since shipment got to Johannesburg. Why is the customer being punished for FedEx mistakes??