Uregent problem about payment

Hi. This is Rosey from Finance team of Fairfield by Marriott Seoul.
My property made a payment with Virtual card for a reservation, but after the payment was made, the customer requested a shorten her stay. According to your company, the refund processing has been completed, but it has not been completed to settle the new amount. The room charge is 101,680 krw, and the problem has not been solved over a month, causing aging. I talk to the Korea Customer Service Center every day, but they only say that there is no way to contact the headquarters of Booking.Com. Trust is the basis for partner companies, but it is hard to understand that they cannot deal with such a problem. We hope to confirm the above and provide a quick solution. I'll be waiting for your reply.