Ola Cabs — Somebody booked ola using my number

Address:

New Delhi, Delhi, 110074

Yesterday around at 8 pm, i got a text that i booked a cab at chhatarpur and the cab is about to reach and at that time i was at home which is at Ansal villa and i ignored the sms assuming its a mistake but after half an hour i recieved the bill amount of Rs 91 of which Rs 1 is deducted from my ola money (i felt lucky that i didn't had more ola money at that time as usual) and other may have been paid by cash. But what if i had more ola money in my account? How can someone book cab using my number by their phones? Its very serious issue which should be looked into immediately. And i want to know the details otherwise my next step will be big one. Please look into the CRN[protected].