Uber India — Driver charged 100 extra cash in non cash trip

I booked Uber bike on Saturday to go to Saltlake and payment mode was Digital. Driver asked me to pay cash and he said that you will refund from uber. So I have ₹100 to driver to fill petrol at petrol pump (cctv footage also there) then I reached destination, after ending the trip driver asked me remaining money for that trip I refused to give and said whenever I will get refund from uber I will give rest of the amount to you.

I have whatsapp proof that he has received ₹100 from me. He also have accepted that. Also I have call recording.

Problem is Uber is not ready to refund my extra ₹100 which I paid to driver.