Builders need to honor their 10 year Structural Warranties!

I bought a brand new home built by a "Reputable" large builder. Within 3 years I noticed cracks and structural damage. I asked the builder to buy the house back.The Builder walked away told me to sue them. 3 years and $200k later I am nowhere. NHIC (National Home Insurance Co) also refuses to pay on the structural policy I have with them. They agreed the house is structurally not sound and accepted my claim only to later change their mind...?...