By skyforbes I've tried different browsers, double-checked I'm on the right account, and I subscribed via the website (not in the app). It looks like the AI support bot can help, but the fact that the method on their Q&A page doesn't work is really sketchy if this is intentional rather than a bug.
Link: https://help.openai.com/en/articles/7232927-how-do-i-cancel-my-chatgpt-subscription