Booking.com Transfer No Show - Promised Refund Not Paid

I made an airport transfer booking through Booking.com, from Hotel Edison to JFK Airport on 06/03/26, under reservation number 399103463. On the day, the transport never turned up at all, which meant I had to urgently arrange my own alternative transfer to the airport. This last‑minute situation cost me an additional 165 USD on top of the original cost of the transport I had already paid for via Booking.com. After this incident, I contacted Booking.com customer service. In their original email response, they clearly stated that they had arranged an overpayment (additional refund/compensation) to be paid into the account of the original booking. However, when this overpayment did not arrive in my account, I followed up by contacting the transport provider directly. They informed me that, as of 31/03/26, their policy had changed and they were no longer able to process overpayments, despite the earlier confirmation in writing that an overpayment had been authorised. I find it unacceptable that the transfer never arrived, that I had to pay 165 USD extra to secure replacement transport, and that the overpayment promised in writing has not been honoured. I kindly request that Booking.com urgently pays the agreed overpayment into my account and fully reimburses the additional 165 USD I had to spend because the booked transfer did not show up. I also expect a clear explanation of how such a contradiction between written confirmation and later policy changes has occurred, and I ask that this matter be resolved promptly.