Give the seller a couple days to respond. If the seller does respond give a chance, if they are willing, to make it right. If the seller does nothing at all go to the BOI forum on faunaclassifieds.com to report that seller as a bad guy and explain your experience. Make sure when you do that you have given the seller ample time to respond and fix the problem in case it is just a mistake.
The BOI is where you can look up a potential seller to see if they are a good or bad guy. Actually I would go there right now and enter the name in the search box to see if there are any other shotty deals reported with this person.
Just make sure you follow the rules regarding the BOI and posting there. Keep us updated.
There is also a buyer/seller references thread here you can search on this site but it is not used nearly as often as the BOI.
Keep all your vet bills and paperwork. Any emails between you and the seller. All details including TOS, shipping, tracking etc.