Booking.com customer support service non-existent.

I made a booking for accommodation via the Booking.com app for a particular date. While on the way to the property I had a look on the app and saw a notification from the property that they are fully booked and that I had to cancel the booking. I then submitted a request for a cancellation and refund of the booking and immediately received a notification that it was a mistake and that the booking is still available. But by that time I already made alternative accommodation and transport arrangements and on the way to a different town. Subsequently I have tried to contact Booking.com and the property via the app but all I received was one no-reply email to say Booking.com have contacted the venue and is still waiting for a reply from them (a week later no reply?). The venue has a no refund policy which I understand, but I cannot be held liable for their booking/ communication errors on their side. I have been stonewalled by Booking.com and the venue who did not reply to any communication (email or via app). Customer care is non-existent as all communication are forwarded to a chat on the app without any response. Several attempts to send messages to the complaints resolution failed as it just states message not delivered. No customer support email address can be found on Google search or the app (it just says contact customer support via your app).

I strongly suspect that this is a **** by the venue to get people to book and get caught by their no refund policy. Booking.com does not seem to care about this and intentionally makes it difficult to contact them to get customer support assistance as they do not intend to resolve any customer complaints.