They may be interested in the future salability of the houses that they are financing. They may have pre-agreed problem resolution procedures set up with the Builder. If nothing else, it may prevent someone else from experiencing the same problems. They are in charge of Building Code enforcement in GA and can also offer interpretations. They are charged with protecting GA citizens from fraud.
Most developers are sensitive to the satisfaction of the home owners.
They may exert some pressure where needed. Sometimes this is enough to finally get their attention. You are not required to have an attorney and the Clerk of the Court can help with the procedures. Pick your attorney carefully. They should have experience in this type of litigation to be effective.