If you have duplicate smash.premium plans, please leave one and cancel the duplicate payment.
Please note that even if you cancel one of the remaining duplicate payments, the notation on the app will not disappear, but if you have completed the cancellation yourself, there is no problem.
■Payment method: Cancel Google Play Store
Please refer to this page.
https://support.google.com/googleplay/answer/7018481
■Payment method: app Store (Apple)
Please refer to this page.
https://support.apple.com/ja-jp/HT202039
Payment method: au
Please cancel your subscription from MY au.