How can i get my sons last name changed on Birth Certificate and Social Security card? We have a court order for the change.

In 2008 my son's last name was changed to my last name in court. We have the court order but can not seem to get any help from ANYONE on exactly what to do to get this information changed. The Social Securirty office says that we need to have it changed on his birth certificate first, but vital records says we need to go to the Social Security office. 7 months ago I sent my son's original birth certificate along with a copy of the court order to vital records with a letter describing the modifications that it needed but I still have not heard anything back. Any advice on what I need to do would be much appreciated!