We're aware of an issue with Facebook purchases for all King Games and our team is on it. 🛠️ Hang tight while we fix things! You can still enjoy the game, and we'll keep you posted once it's solved.
Is this an in-game promotion? I haven't seen anything. By the way, you just posted a link to the game, I'm not sure if you meant too. Can you post an image of this offer, I'm curious to see it.