You can cancel your subscription at any time by logging into your Google Play account here: https://play.google.com/store/account/subscriptions

If you don't see your Invoice Simple subscription there, this likely means it's under a different Google Play account. Please login with other Google accounts you might have until you find the one you purchased the subscription with.

In case you're having trouble canceling your subscription, you can visit the following Google's support page for additional assistance: https://support.google.com/googleplay/answer/7018481

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