Vanilla planifolia cutting rotting & rootless

[DragonFire1089]

This is my first post on here. I need help with my first and only orchid, an around four inche Vanilla planifolia cutting that I got about a year ago, when I first had it there was some roots on it, which have all fallen off and where the roots were has turned black. a few of its leaves fell off along with the new growth at the top, I think where I kept it was too sunny so it suffered sun burn. It only has three leaves left, has become quit dehydrated and is starting to rot at both end.

I'm keeping it in an indoor shelf greenhouse that's about two feet wide and six feet tall, where the temp stays at about 13°C in the winter and 24°C in the summer. I also have a mini desk humidifier in the greenhouse with it.

I will try posting some pictures tomorrow to help, but it is night currently so i cant get any good ones.