This must be done 24 hours prior to the end of the subscription period to avoid being charged.
You can cancel your subscription in the following way:
1. On your Android phone or tablet, open the Google Play Store.
2. Check if you’re signed in to the correct Google Account.
3. Tap Menu Subscriptions.
4. Select the subscription you want to cancel.
5. Tap Cancel subscription.
6. Follow the instructions.
For additional information, please, follow the link: https://support.google.com/googleplay
To cancel the subscription in the app on your Amazon Kindle device:
1. Go to your Amazon Account
2. Go to Your Memberships and Subscriptions.
3. Select Manage Subscription next to the subscription you'd like to cancel.
4. Click the link under Advance Controls to be directed to the main subscription page. From this page, you can end your subscription.
For additional information, please, follow the link: https://www.amazon.com/gp/help/customer/display.html/ref=hp_left_v4_sib?ie=UTF8&nodeId=GTAQFP3SY9N483CU