I understand that you have monopoly and feel like you can do what suits you but I have permanent contract with you for "Voordeelurenabonnement" and you can not change it one sided without my agreement. Esspecialy not if you are going to change it into another alrady existing abonnement. If I wanted to have "daluren abonnement" I would have change it my self. I want to let you know that this is not acceptable and it is not right and I do not agree.
Your loyal customer,