Just had my charge-back rejected today with the money initially refunded reapplied to my account again.
Contacted AMEX and was told that Swiss is not disputing the fact that the flight was cancelled but still the dispute was closed. They are sending me the documentation (including Swiss response) in the post so I will take it from there. The agent said in chat today:
"Since this has become a global issue, almost all establishments are extending their helping hands to make sure there is minimal impact to their users and their customers. Right now I would advise you to please discuss this with the Flight service provider to see how they can help you in overcoming this situation"
I find it interesting that AMEX initially (when I raised dispute) did not ask for any documentation.
I suppose I will have to send all documentation and request a chargeback of the representment.
I am so annoyed, BA refunded canx flights within 3 working days, Air Serbia 6, easyJet 9, still waiting for Ryanair.