TERRIBLE AND NO RESPONSE FROM BOOKING.COM

We booked a trip to the Netherlands end June 2023, with a waiting period at Heathrow airport. We were denied access to British airways at Oliver Tambo because we didn't have a transit visa for Heathrow. Nobody informed us of that new regulation, not even by the VFS global company who scrutineses all documents for Schengen visas. There were about 7 people that had the same experience. So we cancelled our bookings through booking.com the next morning because alternative flights were so expensive. I received an sms to say we would receive our payment back on a certain date. AFTER months of trying to call (we do not have skynet in SA) still no repayment I sent a letter through POSTNET to their physical address, still no response, also on the website and through the booking hosts. WE ARE SOOOO disappointed in their service. It would be my husband's first time to go to Holland with me to my extended family