Ola Cabs / Ani Technologies — charging extra money from customers

My bill was 444 and 50 was paid for toll fare total amount was 494. However ola driver charged me 550. When i called ola customer care they didn't had any reason. They don't check their drivers are their drivers are cheating customers. I will be going to complain this thing in consumer court for cheating. 50 is not a big amount but cheating a customer is a big deal.