I have just got one Wanda, and have really no experience with this chid... but i did manage to save the one i have after loosing all of its roots, and over the half of its leafs...
When i bougth it, the leafs where all dried out, same as the roots, and they where all gone within a month.
I pu it into my terrarium (slider terrarium) on top of some living Sphagnum moss. Adjusted the light and left it alone... hoping for the best.
Sprayed it with warm water several times a week, and made sure the moss was always moist and the Wanda never covered.
After nearly another month, i noticed a little "bump" on the steam, and two months later, it grew a thick new root.
Then i started to fertilize a little once a week, and kept it in the terrarium. Theres high humidity and warmth, and air as well. I have a fan i set on once a day, and thats about it...
Now, finally, it seems like its going to survive! Its got another "bump", witch i assume is a new root coming out soon.
Wish you the best of luck!