Hi @Marianna53 and welcome to the Community Center. I just created a new topic out of your post and moved it to Help, the previous discussions focused on guest cancellation policies. When asking new questions, a separete topic can help you get better answers related to your query.
Maybe another Host can share his experience with you?
Someone suggested I tweet them and they answered me straight away. The problem has been solved and Airbnb refunded all the overpaid accounts. I suggest everyone to find Airbnb on twitter @Airbnbhelp.