Roku does not offer email or telephone support. In today's world it's extremely rare for someone to not have access to a computer in some way. Public libraries offer computer access if it's not available at home.
As to your mention of auto-charge. Virtually any form of subscription from any provider is going to require an auto-payment schedule. But as a reminder, there is no charge for using a Roku device. There is no subscription for anything offered directly by Roku. No payment is necessary to simply use your Roku. Are there services that can be subscribed to through Roku? Yes indeed. But none of them are required simply to use a Roku.
If you could be more specific about your issue, perhaps someone can provide you with more detailed information.
Dan
Roku Community Streaming Expert
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