Ola Cabs — Paid cash for the trip but app still showing dues

I booked a cab from Anubhav Banquet hall police lines Delhi late to sector 77 Gurgaon in the night and the driver asked me to make payment. As there were elderly people travelling late at night I had to comply with his request. I paid RS. 850 in cash to the driver however I am getting constant reminders from Ola to make the payment again on app. I have already raised this complaint on the app but there has been no resolution.