hard to say. First of all who put the plant in compost?
It's unlikely the shop will have done it. A lot of times dendrobium are sold in coco coir which looks a lot like compost but it isn't.
Coco coir is 100% hydroponic - bark is not. Might not seem too important but it actually is because if you switch any plant from hydroponic to another medium it will get stressed and lose roots.
I can't tell what your plant is suffering from but the bark you have it in now doesn't look that great either but hard to tell from pictures.
If the roots are rotting you need to stop the rot first - then it will be a slow recovery game to see if it develops new roots.
Roots should be white, grey or green, never black or brown
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