So sorry metalised, not much you can do and no legal recourse/appeal as you have agreed to the TOS. FB will not help much either.
The a lesson to be learned here. Zinga learned that with Farmville in other circumstances. If you can, don't build on the top of some other companies, a FB, an Instagram, Pinterest, or a Gmail/Maps. Rug pulls do not happen solely in crypto.
There are exceptions of course: build something good on the top of salesforce and if you get traction (=paying customers) they will buy you.
More and more posts on HN are written to show how evil those companies are (Amazon to their third party merchants, Google or Facebook to their users), but you have choices in life, simply build a different model. The lesson is: don't build your whole business with faceless companies, even worse if you don't pay for the services. What do you expect in return?