From Consumer Wiki
Consumers can contact the Bureau of the Fiscal Service, Savings Bond Operations for questions or complaints about treasury bonds.
Bureau of the Fiscal ServiceSavings Bond Operations
Bureau of the Fiscal Service, ARC 200 3rd Street, Avery 5I
Parkersburg, WV 26106
For Saving Bonds visit: http://www.fiscal.treasury.gov/fsprograms/fs_tss.htm