This is a huge cluster. Personal issues aside (from everyone in this thread,) this could easily be solved.
Jay; Pay the man his money. Then take the animals to the vet to get checked. If everything checks out, then I'm sure Craig will be more than willing to acquiesce to taking the chams back and giving you the money for the vet visit. If not, then you as a "business" person can chalk this up to a lesson learned and maybe write it off as a business expense. By you with-holding money for product that you purchased, it makes you look like a scammer and a shoddy business person.
Craig; while I can see where you're coming from, please take some advice. Quit opening your mouth and giving them a reason to act like fools. Act professional and stick with straightforward answers/questions. If they (Jay & his wife) do not comply, then check into what laws they have broken, and call a non-emergency police line or an attorney to see what options you have. Do not get down on their level. If you cannot handle yourself in a professional manner on here, then refrain from posting until you can. You will only damage YOUR image further if you do not.
Both parties need to grow up a little bit and learn to use a bit of decorum. If you're both doing this as a "Business" I can guarantee you both that you will not look good to other potential patrons if you do not start acting more mature with your postings and the way you handle yourselves.
As for everyone else who decided to throw a little "Pitch Fit" in this thread, I can understand where you are coming from, but this thread is NOT about you, it is about Craig & Jay. Your drama needs to stay on your own threads or taken to PM's. (No I'm not a Mod, I'm just tired of reading it in every damn thread that everyone comments on. We get it, you don't like each other. Get over it. Bickering back and forth in every thread may help make you feel better, but it irritates everyone else. Yes, that is my personal opinion. Though I do like and appreciate the comments that most of you make, it's getting old reading old news.)