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Not all disputes are negative, sometimes you may have a fraudulent charge on an account or an accidental double charge and you dispute it directly with your bank, they may add a dispute to your account history on the credit report but the payment history is still clean.
Sometimes, GW letters can result in disputes being added and those disputes will remain on file even if they remove the negative information.
Did they add negative comments? I had dozens of student loan lates removed (30/60/90/120+) Those 4 accounts have closed disputes and that consumer disagrees but the accounts now show as never late, they just have blank months with my payment history. Helped with scores and with my mortgage.
I dunno, thats my experience, maybe they are actually negative but hopefully they do remove the negative information for you.