Hello Betty,
Three years without growth or blooms in alkaline soil means the camellias are starving. Acidifying in situ rarely works long-term. Dig them up (root balls will be small), pot into ericaceous compost, and place in bright filtered light. Water with rainwater, feed with balanced fertilizer in early spring and midsummer. Reduce watering in winter; shelter from hard frost.
This gives them the acidic root zone they require.
Gill
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