Per ATIS-0300119, Thousands-Block (NPA-NXX-X) & Central Office Code (NPA-NXX) Administration Guidelines (TBCOCAG), Section 11.1.10 “If an SP donates/disconnects a Thousands-Block to the NANPA in error and the Thousands-Block disconnect application has been processed but the Effective Date of the disconnect has not yet passed, the SP may cancel the Thousands-Block disconnect in the NANP Administration System (NAS).