Well, there's nothing for it but a replacement axle, but I don't think you'll have much luck getting replacement parts for a Sram gearhub this side of the pond. I have communicated with Sram several times about this, but their line is always the same. They do not import gearhub parts to North America. If anyone has parts, they are sourcing them in Europe.
Call Sram in Chicago, and ask to speak to Ed. He is the closest thing they have to a gearhub guy. If anyone can help you out, he can.