i called to change a booking that I was having this week with the UK number but they said waiting time was 2 hours, so I just called the US number and waited 20 mins, I had a booking LHR-ZRH-ATH-MUC-LHR, they said if i asked for a refund it could be several months to get the money back. Since I will fly to ATH at some point and my flight was cancelled anyway, I just asked for a open ticket that I can rebook until August with the 50 EUR discount. I already paid top dollar for the ticket, so I doubt the fare difference will be too big, but I understand the concern of people on transatlantic flights as the difference can be huge! In those cases I would ask for a refund.