Oyo Rooms — Oyo is refusing to pay refund.

I booked a room in hotel orient comfort on 15th April through oyo app. I paid booking amount through app but when I reached hotel, they told me that booking is invalid and if I want to checkin I will have to pay extra tariff charges which is not mentioned anywhere in the oyo. As I had no other option, I had to pay extra charges i.e. 772₹ apart from 428₹ which I paid while booking, so total bill was summed up to 1200. They also refused to give me bill. Even though I am sharing screenshot of payment done by me. This is totally not expected from oyo. I just want refund for extra money that I paid which is 772₹ as soon as possible. Oyo is refusing for refund as hotel manager is not ready to accept that he took extra money. Also he asked to pay either cash or do transaction on some QR code which was linked to an unanimous person account.