Can you dispute student loans on credit report?

Can you dispute them and ask that documentation be provided?

Because I know my loans have been sold and sold again all over the place, just like the fraudulent sub-prime mortgages, and when banks can't provide the paperwork tying the homeowner to the mortgage, the mortgage is no longer valid… So same should apply to predatory student loans?

Also, do defaulted student loans come off your credit report after 7 years?

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