No but I downloaded it the previous day, 8/18 - it was the Free App of the day on that day. 8/19's free app was a different Disney wait times app.
But I do agree that if it showed "free" in the box, they should stick to that. It sounds like it changed back when it hit 8/19 but no one updated the box on the screen to revert back to the amount.
I would send them an e-mail and ask for your money back on the basis that it still said free in the box (assuming it did).