Task: Classify the mental state of the tweeter based on the tweet, determining if it is 'neutral or no emotion' or characterized by any of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust).
Tweet: After spending £450 @Debenhams I was offered a £5 voucher. I asked if I could spend it at weekend? Was told 'no valid today only' #unhappy
This tweet contains emotions: 
anger, disgust, sadness