Fiction or Non-Fiction?

She flops the item on the counter and says, “I’d like to return this. When I got home I realized I didn’t need two of them, so I’m bringing one back.”
The cashier rings it up and hands her the receipt. She turns to leave, head bent over it, and quickly turns back, holding up an index finger.
“Whoa. Wait. You only gave me back half what I paid.”
“It was a buy one/get one deal,” the cashier says. “What’s the problem?”
“I’m returning the one that was full-price,” the customer says. “I still have the free one at home.”