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: Zero help from @ups customer service. Just pushing the buck back and forth and promising callbacks that don’t happen.  #loathing
This tweet contains emotions: 
anger, disgust