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: Even after @O2 ref the £5k fraud, they still treat me like dirt. No returned calls or apology #shocking #customerservice @mse @resolvercouk
This tweet contains emotions: 
anger, disgust, fear