You can unsubscribe from the following link.
TimeBlocks products are in-app payment products, and are managed by the store where you installed the app, not TimeBlocks.
Please note that TimeBlocks does not have the right to check purchase history and refund.
Apple App Store
https://support.apple.com/en-us/HT202039
Android
https://support.google.com/googleplay/answer/7018481?co=GENIE.Platform%3DAndroid&hl=en