I moved this to our Inquiry/Feedback forum. It's more likely to get found by someone searching for feedback on Glade Herps this way.
Sounds like a pretty lame situation and a whole lotta excuses. Based on what you've described, I wouldn't WANT an exchange from them, because I wouldn't trust the quality of their animals or their ability/willingness to send another.
In your shoes, I'd ask for a partial refund and keep the animal. I wouldn't hold my breath for the refund, but I WOULD give them a chance to make it at least somewhat better. And if they balk and refuse to offer any sort of compensation for sending out a sick animal, then I'd do what you're doing now, and spread the word far and wide about the experience.