Ola Cab — Payhalf charges more than normal rate

Address:

Chennai, Tamil Nadu

Hello,

I took the ola cab from my office at porur till my residence at mylapore.
The distance in km from the entrance of my office to my doorstep is 15 km.
I used ola cab for picking me up at office and dropping me at my residence for the past 2 days. The charges amounted to rs 260 / - approx.
This tallied with the charges announced by ola i. E rs 100 per first km and rs 10 for additional km plus the re 1 for travel time.
I heard from colleague about the payhalf option and today (26. 08. 2015) , i opted for it.
I started from my office at 4:45 pm and reached my home at 5:20 pm.
I was charged peak hour rate and i had to pay rs 304 / -
I think this is completely not justifiable. I wonder why peak hour rate is applicable even when i start at 4: 45 pm. It would not have not been possible to reach my home from mylapore in 40 min if it was peak hour. It would have taken nearly 1 hr and 20 min at least (Everybody knows about the traffic bottlenecks at dlf porur, butt road and anna university during peak hours) .
I would like a reply from ola.