On the Zambia post;
Massive Mafia, immigration officials dealing with illegal money changers. Some only accept US$ even though their government banned this. The officials do this as they make money in exchanging the US$ after.
Also there is a Credit Card fraud at the ATM!! Our card was cancelled after. Take enough US$ and Zambian money or even better DO NOT USE THIS DOGGY BORDER AT ALL.
I am well travelled and understand TIA, but this border and their officials are criminal.