Often , the BT Mods on this forum will offer to arrange this check ( ORDI ) , if they offer assistance, respond in the way they ask ( it can be a few days ) alternatively call BT and explain that your address within the records system has a error that is stopping you regrading your BT service, and need’s confirmation it’s OK or the faulty data corrected ( quote ORDI ) however it may not be understood by the representative ( not a particularly common request ) .
As far as using the BT FTTP team , your ONT has a unique serial number that identifies it , this team may be able to use that number to locate you in the system and arrange what you want ( assuming what you want is relevant to BT ) , apparently the FTTP number at busy times or out of office hours defaults to regular customer service, so it may be worth confirming you are speaking to the FTTP team if you go down this route
