You are fielding a call from a taxpayer who is irate that her tax refund has not been processed within a previously quoted timeframe. As you begin explaining the actions to the taxpayer on her account, the taxpayer interrupts and starts using vulgar language and is being verbally abusive to you. You have been instructed that if a taxpayer is being verbally aggressive and using inappropriate language, you are authorized to disconnect the call. Given this situation, what would you most likely do?