To file a complaint against TransUnion, use the Consumer Financial Protection Bureau's online complaint tool or contact your state's attorney general. Once you file an online complaint with the Consumer Financial Protection Bureau (CFPB) or state's attorney general, they will forward that complaint to TransUnion. Basically, the CFPB and the attorneys general want to understand what kinds of complaints companies are receiving as well as what those companies are doing in response. TransUnion's customer service representatives will...