If you notice you were billed more than once for a cloud service in the app, check to see if these multiple charge are shown on you bank statement or just in the app. If your bank card was charged more than once, please contact our customer support at firstname.lastname@example.org to further address this matter.
It the issue only occurs in the app, make sure you are using the current version of the app. To verify, open the App Store (Apple) or Play Store (Google) app. Search for the app (YI Home/Kami Home) or (YI IoT/Digit Cam). If the app shows "Update", please update to the current version to see if this resolves the matter.