How do you write a letter disputing a judgment on your credit report?

When you obtain a copy of your credit report, look on the back of it where instructions tell you how to submit a dispute. When you mail it back to them, they will investigate it and send you a written response. If you don't know how to get a copy of your credit report, apply for credit somewhere and when they turn you down you can mail that letter to the credit reporting agencies and they will send you a free copy of your report by mail.