Ola Cabs — Driver charged me 663/- instead of 399/- for airport ride in Bangalore

Address:	Bangalore, Karnataka, 560064
Website:	OLA cabs

INVOICE NO.[protected]
20 Feb, 2016

I booked an OLA cab to take me from home to airport on 20th night.
People warned me that OLA has this nasty habit of cancelling taxi bookings after having confirmed the booking initially, but I went ahead and made the booking for midnight pickup.
Sure enough, I received a message from OLA at about 2330 hrs that my booking was cancelled. While I was shocked and thinking what to do, I got another message with the driver name and car number!!
Anyway, I reached the airport and I got a message on my mobile to pay 399/-
But driver showed me his mobile that said the bill was 663/- !!!
An argument started between us. He called somebody who he said was from OLA and that person told me on phone to pay what the driver demanded saying the invoice would show that amount.
So I paid up 663/- because I was in a hurry and did not have time to call OLA myself. I got the invoice on my email which was only for 399/-!!!
my email to OLA brought no response. I would like an immediate credit of the difference between invoice and what I paid if OLA is a professional and honest company!
Srinivas