Trip.com complaint: Finding hard time with trip.com in changing my ticket date

I booked tickets from trip.com from Toronto to Hyderabad round trip. The travel expenses was 8500 . The ticket date was Feb 02 2023. I want to change the tickets from Feb 02 to Aug 03. I started to change the tickets by logging in trip.com. At the time of booking tickets App allowed me to book but at the time of changing tickets app is not allowing me to change tickets . It says no flights available. I searched all dates for this year but app don’t allow users to change tickets. I started this process on Jan132023 . I called customer service to change from their end. I called more than 100 times in 1 week to change my tickets. Number of time they send me wrong link. They selected wrong passengers. After submitting request and completing my payment . After 3 days i got email that my request was not completed and my difference money was also not credited. My 8500 1391 was blocked with trip.com. Again calling number of times but my ticket was not changed and my travel date is only 2 weeks. For every request the take 3 days time. My health condition also become worse by keeping on calling them and asking for ticket change but no help. Since nearly 10,000 dollars was blocked with Trip.com. This is big amount and i am in helpless situation.