Task: Identify the primary emotion conveyed in the tweet and assign it to either 'neutral or no emotion' or one or more of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that best capture the tweeter's mental state.
Tweet: @Uber very disappointing that support has not responded to my email!! #bad #uber #service
This tweet contains emotions: 
anger, disgust, pessimism, sadness