Was the plant
possibly over watered? I bought two bantels from Walmart in the spring
that were literally setting in a swamp. They had so much water in them
that I had to pour it out in the parking lot before I put them in my car. When I got home I took them out and removed
all the soil they were in, which was just basically mud at that point. I left them on newspaper for two or three
days to dry out and then repotted them.
They have done find ever sense. I
would check the roots for rot since you have one leaf that looks mushy. Luckily, I didn’t have any mushy leaves on
mine but I did have quite few leaves that were damaged and or dried out looking
so I just cut those off. If you have
mush I would remove the leaf and check the roots but maybe see what others say.
I don’t have a tone of experience with them.

From what I understand
too it is really easy to damage the leaves of these plants and they can start
looking quite rough if they set in the store and get handled a lot. A few months after I got the two I have I saw
some more in Wal-Mart and they were perfect, beautiful and quite healthy. The
next time I went in Wal-Mart they were so beat up they didn’t look like the
same plants at all.

Most of what
your pictures show just looks like damage from handling. I would be concerned mostly about any mush or
that they might have been overwatered in HD.

Good luck and I
do believe you can save it if it has not gotten too far gone. I really like
mine and they have been just fine since I saved them from the swamp they were
living in.

The good thing about HD is that if you save the receipt and the original pot with their tag on it, even a dead plant can be returned. I agree with all of BD’s excellent advice. I would unpot it, cut away the rot and spray the plant with an anti-fungal like Physan or more easy to obtain, Listerine. Allow it to get good and dry before repotting into a super well-draining medium.

I buy plants regularly that have negative and crummy looking spots on leaves. Usually, if the plant is generally healthy, you will grow new and healthy leaves. You can trim or remove a damaged leaf. But I must admit, with potential rot so close to the soil line, especially on a Sans, I would return it and get my money back on this one.

In spring when I bring out my sans, they have some blemishes on them as well. Other than what you think of the unsightly looks, they seem to do no harm to the plant. If however you develop soft smelly rot, it could spell death to the plant. Like the good advise given above. I would re-pot using more grit in the mix and let it dry out. They are notorious for over watering and killing plants.

Several times when purchasing plants at those stores, I have to ask a salesperson if I can drain the water out of the pots before I buy them. Even if half the soil spills out, it's a deal. Wrong soil anyhow. In a warm greenhouse where they grow them, they can grow in anything, but in my house, I have to keep it on the fast draining side.