I am curious if you had a buyer's agent or if you used the builder's onsite agents. You need to realize they work for the builder not you. Of course most builders use their own contracts and paperwork instead of standard North Carolina. The best bet is to take your contract paperwork and check with a good real estate attorney. They can tell you your rights. Unfortunately most builder's contracts are skewed to favor them. That is why it is best for you to have agent representation to read over such things before signing.
Hope this helps,