Business ProfileforCWTSato Travel

I am due a partial refund to my government travel credit card for an American Airlines (AA) flight ticket # 7984628548 in the amount of $339. 90. The original cost of the AA ticket was $680.89. The American Airlines return portion of the ticket was cancelled on 8/5/23 by a SATO representative and I was re-booked by a SATO representative on a different flight with United Airlines Ticket # 7986746690 for the cost of $779.20 charged to my government travel credit card. I was told the AA ticket would be exchanged and I would be refunded the total cost of the American Airlines ticket on 8/5/23. On 8/9/23 when I called SATO to ask for verification that the refund was completed, I was told that I had to contact American Airlines for a refund. I called SATO again on 8/14/23 to ask for a refund of the American Airlines ticket, I was only refunded $9.30 (see attachment). American Airlines has refunded me in the amount of $331.90 (see attachment), leaving a remaining $339.90 that should have been refunded by SATO. I also need documentation from SATO that a SATO representative cancelled the Return Portion of the American Airlines flight and rebooked me on the United Airlines Flight on 8/5/23 due to no connecting/layover flight to Norfolk being available via American Airlines after AA delayed the return flight multiple times on 8/5/23.