Dear Sir/Madam,
I have noticed that my invoice includes a charge of €14.21, although the monthly subscription fee for the NS Flex Weekend 40% discount is €2.30. Furthermore, I have only used the card twice.
In light of this, I would like to kindly raise an objection to this charge. I also wish to cancel my subscription and respectfully request a refund of the €14.21 to my account.
Thank you for your understanding and assistance.