Ola Cabs / Ani Technologies — About a trip

I have started a trip at ola on 29th at around 11-11.30 at from Sealdah to newtown.. after completing the trip and giving the cash to drivers hand the trip is showing still on.. I have called the driver and he is saying that he has already completed the ride and on a different ride.. I will not pay anything if charged extra for this faulty app or anything wrong. Fare was showing 490/- which i already paid to the driver.
Car num - WB39B6997