Currently, there are three major credit bureaus, Equifax, Experian, and Transunion. In order to dispute a listing on a credit report many offer an online method to do us. Disputes can also be sent in via the postal mail. In addition disputes can placed over the phone. The phone number to Equifax is (866) 640 2273, Experian is (888) EXPERIAN, and Transunion is (800) 916-8800.