Den. Enobi purple splash problem

[Tim P.]

Hi everyone...
So the orchid bug hit again. ( Hit my wallet harder . I decided to bite the bullet and purchase this dendrobium that has been on my list for a very long time. It just got to my house today... And I was so looking forward to someting to make a bad day better. Well, as history would have it my stars were not aligned. The plant I received has 90 percent of the root mass dead (I'm being generous with that number). Beings this is a hard to get plant and I specially picked this plant for its flower coloration I don't want to return it. I will try to make things right with the seller, but in the mean time how can I coax the plant to put out more roots? I'm not familiar with this type of dendrobium culture, but I know they grow seasonally... Which worries me. What would you guys do to make this plant servive and hopefully thrive? Should I cut all the mush off and repot? Leave dead roots on for anchor? Maybe give it a different pot as this one is odd?