Proof of hotel reservations for visa application

I’m trying to apply for a tourist visa to china, flights and hotel have been booked, all I need now is a Chinese visa. I booked my hotel with my flights on Trip.com and I submitted an e-receipt of my flight and hotel (including the hotel name and check in check out dates), but the embassy still rejected it. I have contacted Trip.com and the hotel themselves, they said that they cannot issue me a proof of hotel reservation. What should I do?