Ola Cabs / Ani Technologies — Charging twice for the same ride.

I booked Ola Cabs from Mumbai to Nashik and back the following day on 1st April 2022.
On 2nd April, after dropping me back, the driver Mohmmad Wasim said he wanted cash payment and refused to accept Ola Money.
I paid the amount.
Later, Ola Money charged the trip fee to my postpaid (which I had not asked or requested for) and now they just keep adding late fees to that amount.
I have mailed Ola thrice so far but the company hasn't responded.
Their Bangaluru office numbers don't work. In fact, Ola doesn't even have a toll free or any kind of customer service number.

I have no idea what to do.
The amount they're asking me now is Rs. 7500.