kenster wrote: Rear stays were bolted securely and it's the hangers that are bent. Trying to contact couriers now
It is impossible to tell from the photo how the axle/cones/locknuts were used now, but if correctly i.e. like a hub keeping the distance between dropouts of 130mm fixed then it is impossible for the stays to have been squished to 100mm OLN without the axle coming off or getting bent. Indeed if the axle was in place correct and intact (and obviously not bent) then stays being squished during transit should in fact cause them to spring further open when the axle is released. I guess what I am saying is that if the axle was in place correctly main damage was probably done before transit; unless of course if there were signs that the package was opened before you received it then all bets are off.
If the frame was sent by the seller (rather than picked up by a courier commissioned by you) there is no point for you to talk to the courier - they don't have a contract with you, or liability to you, or insurance if any for your benefit. The seller would have to deal with them.