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