I just ran into this last night: I took a cab home from the airport. One: he had no gps and took a wrong freeway change getting home. Two he barely spoke English. Three I basically had to navigate him back on track and painfully turn by turn. End of the trip I go pay, and he's sad that I want to pay with a credit card. Then the tip meter only has 20% or other. I hit other with a much lower tip. He cancels the transac…
I've had this tried on me before, in Chicago where we're supposed to have super strict taxi laws. The correct response is to dial 911, not 311, and say you've got a taxi attempting to rob you. Notice next time you walk across an intersection at a stop sign, who comes to a complete stop more.. the average driver, or a taxi cab. Taxi's fear police way more than the average driver.
BTW: If it was me I would have walked out, when he attempts to accuse me I'd invite him to call the police. He's trying to change the price after the fact.