Ola Cabs / Ani Technologies — incorrect billing for ola

We booked a cab with driver name sonu. While booking the app showed ₹17 by applying a coupon but when the app showed the bill it was ₹90 and we had to pay it by cash. I am totally angry and do not know why such kind of things are happening. That is totally fraud and i am going to complaint it forward in many places. I will also write blogs at many sites including review on google and google play store in the app section. I want all my money to be refunded back to my account and want this issue to be solved. Please take the required action against them.