Hello @Sarah-Jane7,
The post that can be found as described below has information on contacting them via Twitter and Facebook. I've found them to be responsive and helpful when contacted on Twitter.
Type "contact airbnb" in the "Search the community" box on these forum pages where you posted your question. Scroll down a little in the list of suggestions that appears and click on the "Contact Airbnb: A Community Help Guide[UPDATED]" one. That lists phone numbers and ways to contact them via Twitter or Facebook.
Steve.