Heroic tavern brawl purchased itself (iPhone)

I opened the tavern brawl to make the “new” button go away. I read the instructions and hit “I understand” which was supposed to bring up the 1000 runestones/ 1k gold screen. It didn’t. I immediately saw a confirmation loading wheel and then my gold had been spent. I’m guessing there is no way to refund this purchase? I had no intention of purchasing entry

Then you should have pressed the “cancel” or “go back” button, instead of the “i understand” button.

I believe it’s either bugged or manipulatively placed in such a way to cause accidental purchasing. I’ve seen a number of reports like this. “I understand” does not mean “Purchase”