I'm so sorry for your experience and for the loss of your puppy
Personally, I would, at the very least, bring this unfortunate event to the attention of the Board of Veterinarians. You can also ask if there have been other complaints filed against him and, perhaps, that may help you decide how to proceed.
Thank you for sharing what happened to you and your pup. Hopefully others will see this and take your valuable advice.
Again, my condolences on your loss.