Ola Cabs / Ani Technologies — ola postpaid harassment through calls

Address:

Mumbai

I used Ola Cabs to book a ride in Mumbai and on completion the driver asked for the ride money to be paid in cash, on insisting so much I paid him. But then I received calls from Ola saying that I should've paid through Ola Postpaid and not by cash.
Also, there is no way to specifically verify that the money has been paid through cash by the passenger unlike Uber which handles it perfectly.
So, since then I have been receiving constant calls from Ola asking me to pay the due ride amount even though I have already paid it.
The frequency of calls has increased so much that I receive around 90-100 calls per day even though I have blocked several of the numbers. It is very irritating and I have tried connecting to customer care regarding my concern but they don't help me resolve it either but just ask me to pay the money.