Free IAPs problem – Call of Mini™ Zombies 2 Review

I want to get free gems but it ask me to install a game so i install it, went back to Call of mini Zombies 2 to get free gems but it ask me to install the game even though i already did and I’m pretty sure that other people who played this game are also having the same problem, please fix this bug.
Review by Kechaslayer2300 on Call of Mini™ Zombies 2.