@David7930
As you are a new host, a cancellation is not a good start and you will receive penalties form Airbnb. If possible better contunue with the reservation.
Otherwise contact Airbnb via there regular way: Airbnb Help: contact
Not sure if UK telnr. is still operational (international version):
+44 203 318 1111
Please note your listing says: 0 beds.
You need to add the sleeping arrangements.
Also it says in the subtitle:
"private room in casa particular", it seems something went wrong when setting the property type.