MRD, here in CA they have what is called a Dental Peer Review Board. It is for issues just like yours.
Years ago, I had a problem wiith a crown done by a dentist. It had to be replaced, as per the ruling of the Peer Review Board.
It is similar to the Better Business Bureau, Contractor's License Board, etc. I am sure they have one, also, in SC.
Good luck. That totally sucks.