When a cancelled subscription turns into a renewed one, Twitch should show more interest in how/why it happened and figure out how to compensate that error, instead of ignoring it. Simply sending email stating "we do not give refunds" and "how to cancel a subscription" is like blaming the customers for an error that has happened despite following all of the steps for cancelling their subscriptions.

Suggestion: Investigate. Ask for information, such as email confirmation of cancelled subscription and renewal. For example, if the cancellation happened well before the end of the time period and the auto renew happened, then it would be a system error, not a customer error. There would be no need to "explain" to the customer how to cancel a subscription at that point.

Suggestion 2: Offer alternate compensation for "unexpected renewals" that happens because of system error. Consider giving a "free" one month sub to the streamer of the customer's choice. An emote pack with new emotes that the customer can choose from (choose 5 from a list of 20, for example) would be another alternative offer. If the customer has never used Turbo before, offer a one month free trial of Turbo.