This makes me so sad! I beheaded my plant once I saw the stem rot, after only a few days as I waited for it to callus this is now what it looks like ☹️ @Soph1e @MaltipooMom 😢 did I just get to it too late to save it!?
So sorry @Sheila30, I think you're right, it was a case of getting to it too late but in all fairness, you had no way of knowing how deep the rot went. Definitely try and save the babies that were on the side.
@Sheila30 let it form a callus before you replant it. It should take somewhere between a couple of days and a week. You can save the leaves from the rest of the plant for propagation and the young plants at the side can be potted up once they've formed a callus.