The error was an item sent to collections that I am not aware of, so far I reported to Experian with a written letter.
      Answer1:You should get your credit report from all 3 credit bureaus. They may or may not match. This is because companies may only work with 1 or 2 credit bureaus (less work and money). Thus, the error might only show on one of your credit reports. Youll only need to dispute an error to the credit bureau that generated the credit report.