it looks like they were doing quite well for a while. the shriveling if the leaves shows not enough water, my guess is someone began to over water to try and perk them up. the problem with that, is the roots inside the potting medium have probably rotted away. the roots in the air are not getting enough moisture to sustain the plant. i would take them out, cut away anything that is rotted, and repot them in new bark mix. or if you know how to do it, sphagnum moss, but here is a real balance to using moss and you could over water easily again. tuck as much of the roots into the medium as possible and hope for the best with normal watering. they will recover, but it will take some time to grow new leaves. phals like to stay damp, not wet. if the medium is soggy, the roots will rot. also other bacteria etc will grow in the medium and cause problems. they should dry out a little between waterings, not stay waterlogged all the time.