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Такой ответ я получил от поддержки. Можно больше в нее не обращаться, а сделать все самому через аккаунт Amazon.

Further in future if you wish to cancel special offers you can do so without having to contact customer support, kindly follow these steps:

1. Locate your Kindle in the Your Devices tab of the Manage Your Content and Devices page.
2. Click Edit next to Special Offers.
3. Follow the instructions to unsubscribe from Special Offers.
4. The next time you connect your Kindle device wirelessly, your device will be unsubscribed from Special Offers