Horrible Service

I recently logged disputes requesting accounts in question Status Codes to be changed from Open to Closed and attached letters from service providers. Why can't this be updated as requested?And this is the response I get: Dispute EXP***0-CD70559, EXP***0-CD70557 are under investigation, please note we do not update account information with just cancelation/paid up letters from consumers we investigate with the credit provider to confirm the status of the account