Ola Cabs / Ani Technologies — Cabs charging high amount

Website:

ola cabs

Mobile no. Used for booking cabs: [protected] and of my cousin.
I bookeda taxi from my appartment - aftab to avadi chennai on 12.3.17 at about 10-45 and estimate showed was rs.450 whereas i was charged only 420/- on return booking at about 3-30 p. M. The same day the estimate came as 450 and was charged 530/- on 13.3.17 at about 3-30 p. M. I booked for journey from avadi to aftab through my cousin and i was charged rs.630/- again today i booked a taxi from aftab to airport which was estimated as 120/- but i opted an auto thinking less amount. But he charged rs.200/- why such enormous difference and where will i claim the difference