Ola Cabs / Ani Technologies — disappointed with ola services

I had taken a ride with ola cab and paid in cash to the driver but after few days i get a message from ola stating i need to make the payment. When asked they said by default the app takes ola postpaid payment and they can't help me with it. I had even suggested then to contact the driver but all they could say was we can't help you. Ended up paying double and uninstalling the app.