Business ProfileforScholarTrip

I purchase a flight through this third party travel company called ScholarTrip. I needed to change my flight a couple days prior to the end of my trip. My coworker was purchasing all the same flights as me and changed her flight at the exact same time as me but through her credit card instead of through ScholarTrip- all of our flight information and changes were identical and happening simultaneously. My coworker was charged a $150 flight change fee and there was no difference in flight fare while Scholartrip was telling me the flight change fee was $200 and the fare difference was $650 (the new flight fare was exactly the same as our original purchase price). They said there was nothing they could do because it was the airlines charges. Clearly this was a lie since my coworker was charged significantly less and we saw the new fare in real time on the airline site. I eventually argued them down to a $350 fee which I agreed to because I was desperate at that point and they insisted they couldnt do better. Their bartering further proves they are lying about the charges and falsely listing them on their invoice as airline change fees and taxes. If these were hard numbers outlined by the airline they wouldnt be lowering them for meThis has to be illegal and fraudulent- it takes advantage of travelers in a vulnerable position and they should be held accountable. The screenshots are of the emails they sent me with the charges - I was on an online chat with them arguing the cost down so they kept sending new emails with lowered fees but the final fee I paid is still a fraudulent charge.