Used to work in a bank, what the bank does, is they will bounce the payment back to the payor, in this case Airbnb or their processing agent. In every company, sits an accountant who will reconcile Orphan amounts, meaning amount not being tagged to go anywhere or has been bounced, to check which is the right account. As accountants in banks and companies, we do this often. Airbnb finance department will then have an unknown sum sitting in their bank account. Unless they do something about it, customer can't do anything to it. Suggest to get service of document address (service of legal documents), and serve a letter of demand, follow by summon else customer service usually doesn't get the legal implications they are putting Airbnb on.