Need help with rootless c.nobilior

[Autumn Child]

I have just rescently bought a c.nobilior online and it came with almost no roots. I asked the grower about why they send me a rootless nobilior and they said that they have just repotted it and they have to cut all the roots into short stubs to save the plants energy so that it will grow new roots faster. They advised me to keep the plant cool and just spray once a day. I have been doing that for two weeks now and no newroot growth. furthermore, It shows sign of desication on its leaves, but the lead pseudobulb is not wrinkled yet. What should I do to promote root growth? I heard that spraying at night might help.