Uber India — Airport convenience fee of inr 100 charged

Address:	Chennai, Tamil Nadu, 603202
Website:	www.uber.com

We booked an uber cab from guduvanchery to chennai domestic airport. I travel often as part of my work. Last time i went by ola and the trip cost was 254 approx. But uber trip, they sent me bill of inr 321, while reviewing the bill i came across this airport convenient charge of 100. I don't understand why they charge this money. This must be refunded back to me.
Fare details are as below:
Base fare-30
13.2 miles
127.48
54 minutes
54
Distance surcharge (0.78 miles)
10
Subtotal
₹ 221.48
Airport convenience fee (12:00 am - 11:59 pm)
100
Charged
Cash ₹ 321.48