Ola Cabs / Ani Technologies — my trip was suddenly cancelled

We booked ola cabs rental and we were getting live update about the driver before 10 mins. We were waiting outside for our car for about 1 h. But our rental trip for four hrs has been cancelled. Ola head office agent whom we approached after our trip cancelled, have not provided any of the resolution / response for the cancelation. And it was our first trip with ola cabs. Due to this reason our programme was completely inerrupted. I want an immediate response from ola.