[VoiceOps] Conversent Communications rejects port out request for incorrect account number

Hi, Does anybody have a clue why all of a sudden carriers started rejecting port out requests for an incorrect account number? Specifically done by Conversent Communications, but I think that L3 and Global Crossing also started rejecting requests with this reason. Until now this type of rejection was received for cell phone numbers only. Any idea how to resolve it? Thanks, Oren