Ola Cabs / Ani Technologies — Money paid twice online and hand cash

I have booked ola cab from omr to tambaram...first time the ola cab driver asked me to pay through online payment...so I have paid through online which the ola cab already linked with an drivers account number..but after rides he said the payment was not received and also need to pay in hand..dont know what I have to do..I have paid it again..