Task: Determine the prevailing emotional tone of the tweet, categorizing it as either 'neutral or no emotion' or as one or more of the given emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that most accurately represent the tweeter's mental state.
Tweet: @lebara - worst possible decision I could have made when arriving in the UK. Shocking service. Poor coverage. #unhappy
This tweet contains emotions: 
anger, disgust, fear, sadness