The cashier shook her head. Manager: “Tell him now.” She took a breath. Cashier: “Yesterday, a customer returned an expensive coffee machine. The supervisor told me to process the refund, but he accidentally entered the machine’s barcode as a sale on your transaction today.” I stared at the supervisor. Me: “So you charged me for a coffee machine I never bought?” He immediately became defensive. Supervisor: “It was a system error. These things happen.” The manager turned toward him. Manager: “System errors don’t explain why you refused to review the transaction or check the cameras.” He took my receipt and examined the register records. Within minutes, the $349 charge was reversed. I thanked the cashier for warning me. She smiled. Cashier: “I didn’t want you leaving without knowing.” As I was about to go, the manager called me back. Manager: “Sir, there’s one more thing. Would you be willing to stay for five minutes?” I was exhausted, but I agreed. He explained that several customers had complained about unexplained charges over the previous month. The investigation revealed that the same supervisor had been making mistakes while handling returns and then blaming the cashiers. The manager had finally found enough evidence to suspend him pending an investigation. The supervisor walked away without saying another word. Before I left, the cashier leaned toward me. Cashier: “Thank you for asking them to check. We’ve been blamed for things we didn’t do.” I nodded. Me: “You were the only person here who was honest with me.” I finished my shopping at another branch the following week. But I still remembered that cashier’s advice. Always check your receipt before leaving the store.