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: @virginmedia shocking service for your call centre staff this evening. Transfer me and cut me off after waiting forever to speak to someone.
This tweet contains emotions: 
anger, disgust