Rebooking flight / no reachable customer service

I have to rebook my flight. I am in the US now, but didn’t consider that E.T time would be considered as opening hours, so I was 40 minutes late when I called SAS. Online it isn’t possible to rebook it says to contact customer support. Now my flight is in 29 hours and I need to reach them on time. If I don’t rebook a one way flight will costs 2500$. So I would rather rebook. Also none of the other countries can be reached as opening hours havent started. Can anyone advise me what to do? I can see that gold / diamond members have 24 hour customer support, is it possible to use anyones member number to request rebooking?