Creating an 'Ad-free' version of the game

Hey,

I've got a game that contains ads, I've also got an option to buy an ad-free version. What I figured was, I would wrap the ad blocks around an if statement that was if not adFree == true display ads. (see attachment)

Whatever I do though, the ad's appear... Am I missing something?

Cheers

Should it be an and statement rather than an or?