Cab Bazar — Wrong information given before booking

I called customer care to check for details for booking. They told me that state tax would be 500 for Bangalore to Munnar.
So, I booked the cab.
Post booking, I checked with driver, he told me that charges would be 4, 500.
I called customer care again, now they said 1, 200. later on changed to 2, 800 and then kept giving lame reasons.

I asked them to cancel, they refused to pay back my advance payment.

they took my advance payment on basis of a certain information which they provided. This information was proved to be false later on. So, they have cheated me by providing false information.