Determine the emotional tone of the following 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.". Use the provided emotions: anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust. Respond with the emotions you identify or "neutral or no emotion".
anger, sadness