I need little bit of help: guest sent the inquiry for the apartment and I declined inquiry regularly and on time (I have a proof). However, the guest claims that he was charged like he booked the space. I did not receive any money on the account and I don't know if this kind of a situation is possible anyway? I need advice what to tell him.
Since there is nothing you can do, @Gojko0, tell him (politely) that he needs to contact Airbnb if he has been charged in error. This is between him and the company.