have you fixed someones credit?

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i took a course last year on finding tenants who want to purchase a house but they can not due to bad credit --> lease options

i have a paper that shows me how to fix their credit. basically i file a complaint.  1 letter to credit bureaus, 1 letter to creditors (best buy etc.) and letter 3 to the credit bureaus again.

has anyone ever done this?does it work? heard of it?