Overcharged By the Taxi Driver in Turkey

I got charged too much by a taxi driver in Turkey. I was waiting for a transfer, and when I stepped outside, I saw the guy in the car parked right by the hotel. He glanced my way, so I shared my name, and then he invited me to hop in. I asked him if he could give me a ride to the airport, and he agreed. But, halfway through the ride, he said it was a paid trip and that if I didn’t cough up the full amount, he’d just take me back to the hotel. He was driving so slowly that I nearly missed my flight, and he even pulled over to grab a coffee! I was really upset about all this because he charged me £65! License plate: 34 THT 77