Do you have a copy of the builder's policy?  It should have some potential contact information that would be helpful as a first point of contact.

If you don't have the actual policy, there may be other warranty information that you could access. For instance, frequently, the documents you signed at closing will include the builder's procedures on requesting warranty work along with multiple contact numbers, so search through your closing papers.

Do you know if you have a Builder's 2-10 Home Warranty? If so, you're in luck! These policies were frequently issued as an extra "insurance policy" to cover the buyers for durations longer than the 1 year builder's warranty and for situations when the builder was not responsive. Go to http://www.2-10.com/ to get information on how to locate your policy or for their contact info. There were other "adjunct" builder's warranties that were sometimes used in Georgia over the past several years, but 2-10 (in my experience) was by far the most popular and commonly used.

You may also want to check to see if the builder has a website (if it's a national builder, it's very likely) and search for warranty information there. For instance, DR Horton has a link to request warranty work on their site, and you can at least request that someone contact you that way.

Last, but certainly not least, CALL THE AGENT WHO REPRESENTED YOU DURING THE TRANSACTION. He or she may have answers on this specific builder that would be the most helpful of all.

Best of luck to you! By all means, let us know if we can assist you further.