How do I dispute negative items on my credit report?

I have one negative item on my credit report. How do I dispute this item? I have heard that if you dispute an item and that particular company does not acknowledge it can be removed from the report all together. Is this true, and how do I go about doing this? The negative item is from Mac Tools Distribution, if... show more I have one negative item on my credit report. How do I dispute this item? I have heard that if you dispute an item and that particular company does not acknowledge it can be removed from the report all together. Is this true, and how do I go about doing this? The negative item is from Mac Tools Distribution, if that will help. There is an address on my report although there is no phone number. Do i need to call them, or a different source?
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