I will chime in.

The spots appear to be fungal or bacterial in nature. This can actually be due to rot OR occur on it's own.

If you do not (or cannot) return it to the vendor, please try these methods for management of the issue(s):

1. Check roots for rot. Normal roots will be yellow, white, tan or green. They will be full and firm, and have no odor, other than "dirt".

Rotted roots will be stringy, mottled, can have black or brown areas, and there will be a funky smell.

If the roots are rotted, you will need to restart the plant. Cut to the nearest HEALTHY node.

Repot in well-draining media, like 50/50 perlite/orchid bark.

2. Remove all leaves with spots. Take a cutting or two of the healthiest areas of the plant, as backups, in case of failure.

3. To treat for fungal:

I use cinnamon paste AND cinnamon mist. To make the paste, I use regular ground cinnamon, and add water until it is just damp.

To make the mist, I use 3 sticks of cinnamon in a mason jar of water. Let it sit overnight (or longer). Put in spritzer or mister.

While waiting for the cinnamon mist to "develop", use the paste on EVERY part of the mature plant, as well as the cuttings, stems and all.

Once the cinnamon mist has developed, rinse the cinnamon paste completely off of the plant and cuttings. On the plant, mist all of it with the cinnamon mist, but be careful not to spray the potting media directly, if it still has roots. A bit of spray dripping onto the media is ok, but you don't want to drench it. If it does not have roots, it is fine to spray the media. Also, be sure to spray the root stem (the stem that roots will eventually grow from). Same with your backup cuttings.

Let the cinnamon mist dry completely before returning to supplimental light/sunlight. In 3 days, rinse plant completely.

I find this treatment works spectacularly or fungal infections.

I also have noticed with fungal infections, after you treat with cinnamon, some spots' outer edges will yellow and the leaf will eventually fall off. Other spots will just dry out, leaving an indentation or hole. I have not had a plant with a fungal infection NOT recover, but they may look quite ugly with leaf loss and holes. I usually just restart the plant, after it recovers.

4. Since you don't know if what you have is fungal or bacterial, go ahead and use an antibacterial agent on your plant. It won't hurt it. If it is a topical antibiotic, be sure you have rinsed the cinnamon mist off completely, first. If it is a systemic drench, you can treat simultaneously.

You cannot use a systemic on cuttings, though. No roots to uptake. Usually, I just dilute the systemic and spray directly on cuttings.

I use Serenade for bacterial infections.

Usually, with bacterial infections, the leaves will stay on, but the spots will remain indented or turn into holes.