@Roman349
US and Canada phone numbers:
+1-415-800-5959
+1-855-424-7262 (toll-free)
Grab a book, you might be on hold for a long time.
Do I understand correctly that the dates you booked have already passed? If so, I don't understand how the fact that you're sick with Covid-19 factors into this. Airbnb is granting full refunds to guests who can't travel to their destination because they are currently infected, but there's no special provision for guests who cancelled the booking before they were diagnosed.
Do you have any other evidence that the listing was fake, or are you just going by the phone call? Perhaps if you post the link to the listing we can do a little armchair sleuthing.