I created a chatbot using Dialogflow, hooked it up as a facebook messenger chatbot for my personal fan page (A fan page for my app).
I passed through the first review pr
In this case, I would go to Facebook Support and rise your question: https://developers.facebook.com/support.
Another approach would be to change of your solution provider. Dialogflow has the disadvantage that they force you to create a Facebook App. There are solutions which does it for you, you don't need to verify the business, go through App approval, etc.
If you need free hands with custom solutions or even hold the chatbot code, than I would recommend programmer tools like:
If it's a simple chatbot you could take advantage of chat bot builders like:
Disclaimer: I work at Amio.