Firstclass: "In this case I am entirely satisfied with the efforts of our customer care team."

Would you be satisfied if you cancelled a service and the service provider already confirmed via email that they acknowledge your intent,
and they confirm the cancellation!
Then, next they go ahead an try to charge your credit card for a modem anyway ?

Is this what you call "entirely satisfied" ?

As a customer I am certainly not even close to call this a "service".
I think we agree to disagree here.

You're getting a refund of the connection fee which they didn't have to do.

Move on.