Why this happens
A completed cancellation and a later restart are separate events. Netflix recommends changing the password and signing out devices when preventing someone else from restarting membership. Before treating a bank entry as a new renewal, also distinguish its transaction date from the date it finally appeared at the bank.
What to do
- Find the original cancellation email and read the current account status and billing history.
- If the membership was restarted without your intention, secure the account with a new password and sign out devices, then complete cancellation again if appropriate.
- Ask Netflix support to review an unexplained charge using its date, amount and the cancellation reference.
Check the result
The desired result is both stopped renewal and controlled account access. A password change alone does not cancel a currently active subscription or automatically reverse a charge.
Official sources
Check the linked provider instructions for your plan, country and purchase channel. This independent guide does not cancel a subscription for you.
Full Netflix cancellation guide