Ola — Ride

I had booked a ride from Carmelaram railway station to my then pg which amounted to 221 rupees.
I had given payment method as Ola postpaid. But on insisting in between the ride, I had to pay the amount to a petrol pump when the auto driver stopped in a petrol pump to fill gas or else I would have been thrown out.
Now I am getting multiple messages from unknown numbers threating me to move legally for not paying the amount in ola again.
I had tried raising a complaint in ola but they never accepted. And I had informed this to an ola executive who told she will look into it.
But other than these threating whatsapp messages from multiple unknown numbers, I have not got resolution for my complaint.