Please analyze the tweet "@redBus_in #unhappy with #redbus CC, when I talked with them before a week still they didn't initiate the refund of the transaction." and classify its emotional content. Choose from the following emotions: anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust. If no emotions are detected, respond with "neutral or no emotion".
anger, sadness