I would follow Goldorak's advice, but you post is a bit hard to follow.
In your claim, I would restrict myself to the facts and not add unrelated information like the LOT fare or the hotel info. or the weak WIfi.

My understanding is that you bought a return ticket from Poland to JFK on AF and bought a wifi onboard pass for 40: The problem arose on your outbound flight (WAW-JFK). Or was it on the return flight?

Regarding WiFi: Apparently you bought a wifi pass on 1 October. Then you want to cancel it and ask for a refund and get it.. I don't understand how you knew that WiFi does not work and I assume that you cancelled wifi also on 1 October. But you only mention a text received around 6 October (6 hours before departure).

Regarding ticket cancellation: Apparently (if I understand correctly), you called to cancel WiFI around 1 october. The agent understood that you wanted to cancel the whole ticket. Only the WiFi part was refundable. It could be that AF listened to that conversation and heard that you desired to simply cancel the booking. Maybe there was a language problem. On the website you can request a refund of your ticket costs OR your extra options,

SOme clarification maybe needed.