Ola Cabs — Fees wrongly charged

I barely use ola . once i booked a cab which i paid in cash to the driver but later i got the text that you used ola postpaid and need to pay 580/-. i have no idea about ola postpaid. now i am getting continuous calls from ola forcing and threat to pay which js very irritating.
i already paid to the driver.
please look into my concern
-Ayush Srivastav
[protected](ola registered number