Phal Sweet Memory droopy leaves and not growing roots

[Misscd15]

hello!

I bought a Phal Sweet Memory about a month ago, when it came in the mail the roots were not in the best condition - quite a few rots and lots of breakage in the roots that started to turn black/brown.

It has one "new" root that look like its emerging but is growing very very slowly (please see the attached photo) - it pretty much looked like this for the past month and only got a tiny bit bigger. it also has these black dots that look like molds on it - is this normal? or something to be worried about?

the leaves looked healthy when it came but it's started to become droopy and soft recently, no changes otherwise - is this a sign of under watering?

Thank you!