Tealady, I have seen several Television advertisements for this specific problem where they inject foam to fill the void and stabilize the slab. I do not recall the name, but a Google search on foundation repair should get you to the company. I am guessing this will be the lowest cost repair option. I am very disappointed in home warranty and the builder, and hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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