When I was in Milan, I was told by the gate agent the fee for the bike case would be 125 Euro, I should have only paid $75 US at the time maybe 60 Euro or so. I asked to speak to a supervisor. The supervisor came over and I explained my issue. She looked at my bike case and asked "Is this yours"? Yes. Looked at my clothes bag and asked, "Is this yours"? Yes. She then said if you can get everything in the small bag into the case everything goes for free. So there I am tearing all of my dirty clothes out of my other bag trying to stuff them into my bikes case right in the middle of the MXP airport.

Both the gate agent and the supervisor was wrong. But in the second case it worked to my favor and I wasn't complaining.