Booking.com Hotel Reservation Cancelled Without Request

I had made a reservation via Booking.com at Jaisalmer Marriott in the name of Disha P*** for 8–10 December, under reservation number 6376952652. We did not cancel this booking ourselves, but when I checked the “Manage Booking” section on 1 December, I saw that the room appeared as cancelled. Since we never requested a cancellation, I believe there has been an error or system issue. This situation is causing serious inconvenience because we are planning to stay at this hotel on the specified dates and now have no valid confirmation. I kindly request that my original reservation for 8–10 December at Jaisalmer Marriott be reinstated and that I receive a written booking confirmation again as soon as possible in my Booking.com account and by email, so that our stay can go ahead as planned.