Sir Cancelot says: This is how I cancel things. Firmly. With a seal.
Write a firm, polite cancellation letter/email to [COMPANY] for my [MEMBERSHIP / SUBSCRIPTION], account name [NAME]. I want cancellation effective [DATE], written confirmation, and no further charges. Mention I'm keeping a copy. Under 150 words. Also tell me how to send it so I have proof (email, certified mail, etc.).
Works in the free versions of ChatGPT, Claude, Gemini and Copilot. Never paste passwords or account numbers.