Bought sushi but they forgot spring rolls

I bought some sushi, paid for everything (after the woman at the counter seeming very disinterested took her headphones out.) After she handed me the bag, I left. When I got home I saw that she forgot my spring rolls. I paid R 30.00 for those. What's more, I wanted a take-away and instead of just letting me pay for it, she handed me a bill instead (obviously wanting a tip) - very cheeky.