I had it removed from the bill entirely as I don't make it a habit to pay for inedible dishes I'm served, but interestingly they still charge you tax + tip (service charge) on the full amount.
Still seems really shady to list one menu price and then try and charge you a different price without notification at all. As that turns out to be standard practice, and not merely a fluke, it worries me about ever returning for more than gelato/sorbetto. Not the kind of place one feels comfortable ordering extensively.
Thanks for the welcome!