Thread:KazuGami/@comment-5346021-20160403221928/@comment-26581601-20160404003807

I've never personally had to do this so I'm not completely sure, but... If you go to the third button at the bottom of the loading screen and select the third option (ダイヤ購入エラー), it should give you a template email about purchasing errors that you can send to them. I believe most of it should automatically be filled out according to your account and device, you just have to add the order number and maybe attach a screenshot of your purchase history or receipt email for the diamonds, or something like that...?