You've stated what the seat map shows, not the class B6 claims it is booked in to. You need to know the booking class to know if it is correct or not.

And then you need to confirm if that's what the actual booking is supposed to deliver.

Also, while I can understand being annoyed at not getting the Mint service for the flight where you believe it was paid for, you're talking about a 5 hour flight. You need to decide just how willing you are to fight this or suffer for the goal of being "right" in a scenario where you have not yet truly confirmed that you are right.