Task: Categorize the tweet's emotional expression, classifying it as either 'neutral or no emotion' or as one or more of the specified emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that reflect the tweeter's state of mind.
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.
This tweet contains emotions: 
anger, sadness