momoese

The only hope for that plant is to remove the corm from what looks to be soggy soil, chop down the pseudo stem in increments until that black rotting center leaf is no longer showing black. You may have to cut it all the way down the the corm and possibly even dig out the middle of the corm to remove all the rot. Then let it dry out a few days and repot it in dry potting soil. I would not water it until I saw some sign of new growth or a new pup coming up.

It doesn't look good for your plant.