Ola Cabs / Ani Technologies — Cheating taking extra money

Address:	380009
Website:	help.olacabs.com

I use ola rickshaw daily from my home to office and it takes only 4 kms, since last a week i m paying 20 rs for the ride and suddenly today rickshawala named dinesh charged me 38rs and in my ride it was showing i took ride of 6km, i want answer how the distance gets changed within a week?? I was not happy the way they cheated me.
Can anyone tell me how the distance changes from 4 km to 6kms?? Will i get my extra charged money back??