@Albert11 When posting on a forum, the format is not the same as sending a text message. Write out your entire issue in one post, not write one sentence and then send, then another and send, if you expect other users to read what you have to say. I'm sorry you've had this issue and yes, CS is impossible to deal with these days, but almost no one is going to be interested in reading through 2 pages of one sentence posts by the same person.
However, I did, and there is something very wrong here. You say the guest requested to cancel, and Airbnb then registered it as a host cancellation simply because you didn't respond to her immediately? I can see Airbnb going ahead and doing a cancellation if not getting a response from the host, but there's no way that should be registered as a host cancellation.
You are just going to have to keep pursuing this and try to be patient. The CS rep who did this is totally incompetent and doesn't understand their own policies.