Ola Cabs / Ani Technologies — my ride fare is higher than a estimated fare

Myself Ajantha, on 5th of september 2018 i travelled chennai central from sri maha hostel shastrinagar Adyar. when i booked through ola it shows got the estimated fare around 237 to 269 due to cabs not avail. Driver s very young and doesn't know the route . Delay the pick up more than 1 and half hours. and moreover he collected Otp through on cal before our pickup so he voluntarily delays the pick up. but he charged Rs.498/- its unnecessary. so i want excess chargeable amount .