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I only dispute wrong addresses online.
Mail for everything else. Everything. First of all, it gives the CRAs less time to finish the research. Secondly, it creates a better papertrail for future lawsuits if needed. Lastly, you can write better explanations of why you are disputing -- the online disputes lack all of the possible reasons for disputes, including laws and regulations by the CFPB and other federal organizations.
Sure thing!
I've seen a lot of online and telephone disputes of others go sideways and against them in ways that were virtually permanent in nature.
I used written disputes very successfully because my disputes covered exactly why I was disputing something and what my rights were under what law and what the requirements were under the law for them to correct the mistakes.
I never, ever disputed something that was factual and correct. The closest I got to disputing something factual and correct was when the original creditor was heavily fined for the product and I never saw the proceeds of that fine for my account. The dispute was successful because I included all of the history of the violation and the fine and how it was not applied to my account. Two CRAs deleted within a week of getting my USPS dispute, and the other CRA deleted the second time I disputed it 6 months later (identical dispute).