I have been using since September 2022. I signed up for a year on the Super fibre course, so I should only have to pay £22 per month, but payments were being made at £35 each month. I would like to resolve this issue.
Set a Payment PIN on your account so that no-one but you can buy memberships on it. Check your bank accounts monthly for any other unexpected payments to Now. That way you can at least nip them in the bud, while you and Now figure out whose fault they are.