@Martha-Jean0, I was able to find all 3 listings very easily if I moved the map to Minas.
On each listing it seemed like the calendar was open for booking.
What does a person mean when they say a listing is "blocked"?
Usually that means the calendar has no open dates for a reservation, but all 3 calendars seem open.
The best way to contact AirBnB is still to use the Contact Us button on the help page.
You can put in your phone number and they will call you fairly quickly.
If you insist on having a phone number to call, here seems to be a list:
https://all-about-airbnb.com/post/138799279996/airbnb-support-resources-local-phone-numbers-and-emai...
I don't see a phone number specific to Uruguay, but you can choose from the list.