User blog comment:Burniez/Anyone know how to get back spheres sold?/@comment-220942-20161013144955

Go to gumi support at https://www.gumisupport.com/hc/en-us, register and submit a request, and explain your problem politely (explain your current arena rank and that Demon Robe is a rank 12 reward and that you had obtained it/sold it long before the FAQ was updated to 3 days only). Hopefully gumi will be lenient enough to help you. :3