Uber India — uber- adding previously paid amounts to next rides

Website:

Uber.com

There are multiple issues.
1. Charging me the amount of my previous trip (Which i had paid already) on my subsequent trips. I have paid the amount twice and still the next time i try to book a cab, it prompts me for payment! Such a poor software.
2. Showing different trip amounts in my mobile and the driver's device. What logic is this? I had to pay the extra amount displayed on the drivers device. Whatever promo n stuff was offered had failed.

I need the incorrect amount drawn from me to be credited back.