@fadel,
You put a lot of personal information on a public website.
Open the message. Click on the three dots in the bottom right side.
Delete the pictures or blur all the personal information like name, address and chipcard number.
Edit: from the pictures it looks like you already had a Dal Voordeel subscription. And then you purchased another Dal Voordeel on a new card eather for yourself or someone you know.
For more information contact the NS customer service via phone (quickest) or chat. A private message through Facebook or Twitter will take at least a day before you get a reply.
Edit 2: the second message says you already paid. Did the 61,20 euro get taken from your bank account twice?