Ola Taxi — ola taxi booking

Dear sir / madam,
(1) on[protected] early in the morning at about 6.15 am using ride now option, i contacted the driver mr. Vinoth for taking a trip to thiruverkadu from saligramam. The driver told me that the present with him is about to complete and he will call back me within in 5 minutes. But no call received and i also tried to call him. But i received a message saying that the call was canceled and to pay the cancellation charges. The point is i have not canceled the trip but it looks driver himself canceled the trip.
(2) later i tried 3 times to pay the cancellation fee but my phone is hanging.
(3) afterwards i could not make another fresh booking for my trip. I do not know what is the solution for this.
Thanks