Definitely call corporate then.
Send a pic of the snake with the demand that a vet or yourself (if you think you have the ability) rehabilitate this animal.
Corporate cannot allow this franchisee to devalue the entire franchise, that would be less money for corporate and a boat-load if ticked off franchisee`s:cens0r:.
It wouldn`t hurt to make a youtube video documenting the animal and the store, share that with corporate and advise them that the video will go public if your concerns are not handled promptly. It aslso wouldn`t hurt any to mention you are a long standing customer (i.e. you already help pay their bills) and, if dealt with satisfactorily you would continue doing business with them.
With a bit of luck they will improve their training regimen over this.