Hi @Cherry22, like @Gordon0 says. When they paid by paybal, it was probably not an official booking. Airbnb is a website, that handles everything: contact between guests and hosts, payment, insurance if there are damages. If the guest paid on airbnb, they got a booking confirmation with information to contact the service. They can also do it via the website by clicking on their reservation.
If they paid the host directly, ghere is no reservation and it is harder to find the contact.
Do you want the UK number? The grlp section of this forum has some lists created by fellow hosts, listing thd number for different countries. Or you can flag your own post here with the little flag. It has only the option “inappropriate content” but you could use it to get the post read by a member of the staff.
You could pst a message “please call me vack, my address is used for a scam listing on airbnb and guests arriced at my door. “ you need a real phobd number in your profile, as you cannot post a phone number here. Then flag your own post. I believe someone will look into it and try to find the fake listing.