You should retain a local construction lawyer from Avvo to investigate the problems to determine what remedies which may include warranties and consumer fraud issues.
I agree with Mr. Lassen about consulting with an attorney familiar with construction problems. However, it sounds like you bought this home from the builders or his/her representative. If so, you may have issues with the home being built in good and workmanlike manner that meet the standards in the industry. Besides the warranty question, it also appears that whoever is responsible for the warranty, if any, is failing to address these issues and is in breach of the warranty.
Consult with an attorney as soon as possible.
My response herein is an attempt to give you general information and direction and is not intended to constitute an attorney-client relationship as perceived by state law.