If you are not satisfied with your Appstore purchase, please contact Apple Support (https://support.apple.com/contact) as soon as possible for a refund.
Should you have any questions or need more information, please do not hesitate to contact me. I do my best to check and reply to e-mails on weekday evenings, Japan time. If you have not received a response from me after a few business days, I suggest you check your junk mail folder. Also, depending on the settings of the email provider you use, my emails may be deleted instead of being sorted into your spam folder. If you do not receive a reply from me, please resend from another e-mail address.