Uber India — invalid amount deducted from wallet

Address:	Bangalore, Karnataka, 560076
Website:	Uber.com

I tried booking a cab using uber app. The cab didn't get booked and amount has been deducted by uber of approximately rs. 300. When i tried to track, it says amount is onhold by uber and will be refunded next day. I want to know how is uber eligible to take and keep user's amount on hold.in this way, i will keep adding all my amount and uber will take all for hold for earn money from illegitimate source. When service was not given how are they eligible to cut my money.
Please help.