I would also contact the vet if there was an obvious difference in the snake before and after the visit. Obviously something happened during the visit, whether that be a broken spine or something else. It seems ridiculous that they would charge you (probably a crazy amount) to possibly damage your snake. I understand mistakes and accidents happen, but like Chris said, as a professional, they should at least try and help you figure out what went wrong.

It's sad but I think the majority of vets care more about emptying your pockets than about acting like the professionals they should be, or even about the well-being of your pets.