Ola — unfair charges taken

I came from bangalore to delhi tonight and after reaching delhi, i tried to book prepaid taxi. I found their charges a bit on higher side, so i thought of booking through ola. Cab booked, the total amount shown in the app was rupees 140. After reaching my destination, the cab driver asked me rupees 290 (140+airport parking charges 150). I was stunned and was feeling like betrayed.
I tried to find ola customer care no., but in vain. Ola lost their regular customer today. I will never book ola, they're are hiding the actual charges from their customers. Same is the case with uber. I used to be their regular customer, but same thing happened with me 3 yrs back and that day n till today, i didn't travel by uber.
Ola, take a serious look at such things, otherwise sooner other cab service will come in the market and no customer will entertain you.