Honestly at this point, you need to leave these people a review. They sent you an animal that is obviously in bad shape. You need to let people know so they know what they are dealing with.

If you have dated invoices, shipping dates, photos, etc. Leave a review for them proving your case. Maybe they will refund part of your money or something.

I'm sorry he's not doing any better, I have my fingers crossed for him. It's hard to bring them back when they are that far gone.

Just curious, what are you offering him to eat and how are you offering it?