Banana Coves ******** me

I made reservations for the 09th to the 11th October 2020 through Bookings.com on the 28th. I received a surprising emai on the 30th October 2020 that my dates have been amended to the 11th to the 13th October 2020. I tried writing to the host, sending messages and calling but they not answering. Im stressed as i have fully paid for the reservation and they say its a non refundable reservation. I'm stressing completely.