I wanted to book a holiday home over Pentecost. It...

I wanted to book a holiday home over Pentecost. It is available in the TUI booking calendar, I was immediately informed that the booking is binding for me, but availability must also be checked by the host. This should happen after 3 days at the latest. Today is The fourth day, nothing happens. No one can be reached by phone, you will be put off by email. A call to the holiday park brought me the realization that everything was fully booked. What are the procedures? ...