In events like this one it always takes a few hours until the prizes are sent. Please be patient. The official message other winners got is that the prize will be there to be claimed tomorrow.
Well, spending money on this game..... I would not recommend this. But if you don't see the gold then, yes, contact player support via email. But you should get it.
Yes, with events like this one I would definitely always recommend taking one screenshot of your final board! But anyhow, well done for winning and you should get your reward. Happy Crushing!