Today HP have announced that they have removed the free tier from their instant ink program, and users will no longer get 15 pages per month on their account.
This means that from December onwards all users will be placed in a paid-for plan, and will automatically start billing your payment method for the new subscription.
There is currently no way to remove your payment method from HP, so its up to users to cancel their account and buy an alternative printer to avoid HP taking money from their payment method without authorisation.
You can also report any unauthorised payments to your card provider as fraud.
Black friday coming up, buy an alternative brand.