No response from Airbnb "Specialized team" handling a resolution case

[Robin1421]

I reported a resolution case mid July where a guest refused to pay for extra services that he agreed to in the Airbnb chat. I involved Airbnb and multiple agents from some specialized teams got in touch in different intervals. Frustrated over this, I started calling customer service requesting either a callback or to contact them. Last, one agent told me that they do not wish to speak to me and the case is under review. Is it normal for them to behave like this, given its close to 4 months since I have filed this case? Is it likely that they are annoyed at me for persisting on this? Any suggestion?