Ola Cabs / Ani Technologies — non refund of rs. 3204 excess charged against a cancelled trip

I booked a rental on June 6 in Delhi. The car was so dirty from the inside/ outside and I had some international customers to accompany me. I called up Ola Support and the lady on the help line number spoke to the driver partner. The Driver partner agreed that he had not done service and car was dirty. The lady asked me to cancel the trip and the money was to be paid through prepaid, the amount got charged to my account.

Since 5 months I have been following up for the refund of the money, but it has still not come to my account. They are now threatening to do a legal case on me for not paying their current Ola post paid bill which I'm not clearing because they are not refunding my money.