Unhappy Camelia

Camellias like acid soil - they thrive here. I would have thought they'd like your soil SC...........but, they take a while to establish themselves and to flower, so be patient. A frost can zap the buds and the flowers. The buds form in the autumn so if they were planted around then, they may have been using their energy to put down roots instead of the buds.
Basically, I haven't a clue.