Billing is the most common complaint we receive, and it is usually fixable.
Post the platform, the date you cancelled, the screen you cancelled from, and what the charge reads on your bank statement. The wording on a statement often names a payment processor rather than the platform, which is why a charge can look like it came from nowhere.
If a platform has a refund path that worked for you, write it down here. That is the kind of thing no review page can test.