Where's my change?

I have a bill to pay. R817.33 (eight hundred and 17 Rand and thirty three cents) So I take 8 x R100 and R10 in notes, then add to it 7x1 Rand coins, 20 cent coin, 10 cent coin and now what? The smallest demonimation of coin here is 5 cents. So I add the 5 cent coin. There is a stare off and the cashier hands me back the 5 cent coin. Does anyone know why they price things at 99 cents or produce a bill with 33 cents in it, when they don't have the currrency to give out change?