We're aware of an issue with Facebook purchases for all King Games and our team is on it. π οΈ Hang tight while we fix things! You can still enjoy the game, and we'll keep you posted once it's solved.
I agree, too - I'm currently stuck on a hard level so have no chance of winning - perhaps I could go back towards the beginning and win loads of easy levels I've already beaten, but what's the fun of that?