Start by finding the biggest problem spots on your credit report first, then you'll be ready to negotiate with creditors and dispute erroneous charges from there. (renttrack.com)
This can be done by writing a letter to the card issuer letting them know there were erroneous charges on your account. (upgradedpoints.com)
Have you ever bought something over $ 50 only to find it to be defective when you get home, or have a dispute with a retailer over erroneous charges? (personalprofitability.com)