Trip.com complaint: Failed to book flights in time and apply flight credits

I spent a week trying to apply my flights credits for earlier canceled flights with United Airlines.
Since I couldn’t book the flights myself via trip.com or united.com and apply credits, I had to explain my situation again and again to trip.com, so they can help.
During the whole week we only managed to establish that:
1. There really was a past canceled flight, and united.com promised that I have flight credits (which I have)
2. There were two passengers in the flight, but credits to be applied for the one only
3. dates, times and flights numbers to trip.com to book my flights for one passenger only and apply the flights credits
4. They book the flight for even higher price than united.com PLUS processing fees
5. I had to buy thickets myself
6. Eventually, after a week of communication I got a question about info I which is already in the system

Core of my complain:
1. Had to call about 7 times explaining my situation again and again why the second supervisor ed the understanding of my situation
2. Email team is slow, lazy, and not reading notes or the email thread of their own colleagues, so they keep asking the same info which is already in the case
3. While asking the same info I have provided multiple times, I must wait again and again 24 hours, 2 hours, 6,8 hours, etc. each time
4. Rest assured that they work the best they can which is BS, because they weren’t able to understand the situation for several days or make the right notes in the ticket
5. While they were wasting my time, the ticket price raised (obviously), so not only I didn’t use the flights credits, but also I had to pay about $100 more, because I bought tickets myself
6. The price they provided to me was even higher than in united.com PLUS $50 of processing fees

My conclusion:
All the teams of trip.com – email, phone and chat teams are:
– lazy
– incompetent
– not motivated
– not willing to help
– poor internal communications within trip.com