Task: Assess the emotional content of the tweet and classify 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 best represent the tweeter's mental state.
Tweet: Can't believe @virginmedia are putting their prices up!! They already know I'm struggling to pay my bill &amp; won't change my package!!
This tweet contains emotions: 
anger, disgust, surprise