In a related business, AirBNB straight-up lies about its service fees. I got a refund but it was much less than expected and they informed it was their service

In a related business, AirBNB straight-up lies about its service fees. I got a refund but it was much less than expected and they informed it was their service fees, after pressing them that that didn't add up to the service fee in my receipt, they admitted that there is also a service fee hidden in the part that is labelled as going to the host. So they take a chunk out from what I send them and then they also take a chunk out from what they claim to send the host and this matters both to the host and also to me since it affects how much can be refunded. I can't imagine itemizing a customer's receipt incorrectly like this is truly above-board with the law but what am I going to do?