Uber India — driver charged more money from parents

Yesterday on 31st july i have booked cab in advance for airport for my parents. Cab driver asked my old parents to give 200 rs in between the trip saying it is in bill only. After reaching airport in my app it was showing bill of 732 rs. He called after dropping my parents that his net was not working and he asked roughly 600 rs from my parents but after coming out in net it was 732. He said that plz paytm me 132 rs as i m driver and else i have to pay, so we payed it immediately 132 rs. So total he asked 200 on the way raken 600 after reachi ng airport and 132 on paytm almost 932 rs we paid. When my parents called me i complained him that how he can ask more than bill the he talked very rudely. We are very unhappy from his way of cheating and also from uber who did, t take care properly as we trusted for our parents travel to airport on them. We want some action to be taken on him.
His car was maruti suzuki ritz and his name written in app is thavarya. His phone number was [protected]