Booking.com complaint: Missing payment

After a full month of numerous Extranet messages to Finance and calls to the Customer Service to complain about a payment which we never received for renting out our property, we to date have not received a single response from Finance at Booking.com on when this payment will be done to us. We have been using the platform for quite a while, and had numerous tenants through Booking.com, and have been paid for all apart from this one booking. No change in banking details. No one is able to provide a direct number to Finance to solve this directly with them. Customer Service keeps on ensuring me that my complaints has been passed on to their specialist team who is handling it, but I fail to understand how no one is able to respond or make payment in a 30 day period. Truely disapointing and will be leading to us cancelling our property on Booking.com and recommending to others to do the same.