Sorry to see you go! Since you subscribed via the Tribeca Shortlist Android app, you will need to manually cancel on Google Payments, like instructed here: https://support.google.com/googleplay/answer/7018481?co=GENIE.Platform%3DAndroid&oco=1. If you have trouble canceling there, try here as well: https://play.google.com/store/account.
Note: We are not able to cancel this Android subscription for you. It will need to be canceled manually from your end.