I once had a customer call in very frustrated because they received the wrong item in their order. They were upset about the inconvenience and time wasted. First, I stayed calm and let them vent while actively listening. I made sure to acknowledge their frustration by saying, “I completely understand how frustrating this must be for you, and I’m here to help make it right.” Then, I apologized sincerely for the mistake and assured them I’d resolve the issue quickly.