Trip.com complaint: Trip.com refused to refund or refund flights cancelled due to Covid

I booked a return flight to Port Moresby in 2020 under Booking no 12030650061 with Trip.com (Please refer to attachment for details) I received text message and email prior to departure, claiming that the flight was cancelled by airline due to Covid-19. On 7 October 2020, I requested refund on the cancelled flights. After numerous attempts trying to reach the company, I finally reached one of the customer service agents, who claimed that the travel company and airline were under severe financial difficulties during Covid-19, they were unable to refund the money I paid to Trip.com. However, I was promised to use the money as credits for future travels with the websitethe airline. Shortly after Papua New Guinea and China (where I currently resides) partially eased border controls. I contacted Trip.com on 16 January 2023, requesting to reschedule my original cancelled flight ticket in 2023. However, despite numerous attempts to get in touch with various customer service agents at Trip.com, they still refused to honour their previous promise made to reschedule my cancelled flight tickets, claiming that the case occurred a long time ago and is no longer relevant. In summary: fully paid for the air ticket. The flight was cancelled by the airline. Then Trip.com refused refund and promised the money paid could be used for future travel. And now they refused to reschedule the flight. I just don’t understand why such things could happen to a travel company. Please kindly look into the case at your convenience, and see if you could offer any assistance on my case. Many thanks.