Immigration Confusion

We start off the day by heading to the immigration office. The meat of the situation is that when I went through Immigration I lied and and said I was a visitor... because thats what I was told to do. Otherwise it would be a 400 dollar fee, as it is for those here to volunteer or engage in business for more than 30 days. The idiot at immigration gives me the visitor stamp but being an ass puts a B next to it, denoting business. I don't know this fact when I go back to the immigration department with driver Kennedy and Jack to get our visas renewed. The woman tells me either I pay 400 dollars, go to the airport and haggle (which even she says seldom works), or maybe she could ask her supervisor and maybe he could help but probably not. So I say, "GO ASK YOUR SUPERVISOR" in the most respectful tone I could muster, already coming to grips with the fact that I would probably be subsisting on white bread and water for the rest of my time here. Shes goes out the door of the office, past Kennedy, who smiles and raises his eyebrows, and onto her supervisor. She comes back right as I finish cursing Zambian government to hell, stamps the passport and tells  me all is well. Smiles at Kennedy and we are on our way. We walk out of the office and Kennedy starts laughing. Jack and I look at each other, curious. He chuckles and says, "I used to screw her sister"... I realize I really do not understand this place.