[header] How to dispute your transunion credit report [title] Decide how you want to submit your dispute. [step] Transunion offers services that enable you to submit a dispute online, over the phone, or by mailing a letter in the mail. [substeps] If you want to submit your dispute online, you can begin the process by visiting https: // dispute. Transunion.com. 
To submit a dispute over the phone, call transunion's toll-free number at 800-916-8800. Representatives are available at that number monday through friday from 8 a.m.