In-App Purchases Not Working

I love the game and would have given it five stars but I have decided to “unlock everything” but I can’t get the option to work. Any time I try to make any in app purchase the app just closes and gives me an error. I have emailed the company but have not heard back. I would really like to unlock the other features but can’t seem to make it happen. Any help would be appreciated.

BH-NY about Rail Maze : Train puzzle, v1.2.5