Uber India — overcharged the trip without any reason

Address:

Alpine eco apartment, Near rainbow children hospital, Chinappanahalli, 560048

Worst ever experience with uber. Booked cab for the 1st time in bangalore and they charged rs. 550 above the expected bill. They did not generate the receipt and not even sent any email after the trip. It was clearly shown in the app that it was my 1st ride, still they say its because of the outstanding bill. When this was the reason then why does it not show in the app.
They are simply making fool to customers and charging money illegaly.