You need to review, in detail, your credit report from all three credit reporting agencies. You can use AnnualCreditReport.com to obtain your report for free. As you review the report, keep track of any information that you believe is incorrect. Credit scores are built using data from the credit bureaus, so it is important to ensure the data at Experian, Equifax and TransUnion is accurate.
What can and DOES change is whether you have a collector pursuing you for the debt. If you are talking about a dormant account that has been in collections and has finally been left alone with no collections activity for a few years, messing with it can be problematic from the point of view that the collections people will start pestering you again to see if they can get money and if the SOL isn't up, they can start reporting on it again which can affect your score or they could even file suit if your state SOL isn't up.
Credit card consolidation can affect your credit in many ways, depending on which strategy you choose. For example, if you’re consolidating multiple balances onto one credit card, you’ll want to avoid maxing out that card’s credit limit because that will hurt your credit utilization rate (how much debt you’re carrying compared to your total credit limit).

The goal is to focus your financial attention on quickly paying down one debt as quickly as possible. Now, if your debt is accumulated in credit cards, as you make monthly payments, do not use those cards. The credit bureau will see your financial habits, and this will reflect in your credit report and ultimately your credit score. Now, calculating your credit utilization is not hard and is something that everyone can do. Take the time to figure out where you stand and what loans or credit lines you can begin minimizing to reach that sweet spot. This is one of the best ways for fast credit repair.
All U.S. consumers are entitled to see their credit reports. Typically, copies are requested from the “big three” credit reporting agencies (Equifax, TransUnion and Experian). After obtaining a copy, it’s best to review the report. If you need to raise your credit score in 30 days, note any and all errors in the report. If errors are discovered, work to get them corrected as quickly as possible. A creditor may have erroneously reported late payments, or there may be outdated information on the report, like a defaulted loan that has since been paid in full.*
The earlier you find out about a credit report or identity theft issue, the easier it is to solve. To ensure that you find out about issues in the future, consider signing up for a credit monitoring service. Some companies, like CreditKarma, offer free credit monitoring. Other companies offer daily three-bureau monitoring and resolution services. You can learn more about these options here.

Write a letter to the specific credit reporting agency that shows the falsehood, whether it is Experian, Equifax, or TransUnion. Explain the mistake and include a copy of the highlighted report along with your documentation. Although certain bureaus now let you submit disputes online, it’s not a bad idea to send this letter by certified mail, and keep a copy for yourself. The reporting agency has 30 days from the receipt of your letter to respond. The Federal Trade Commission provides advice on contacting the credit bureaus about discrepancies. Here are the contact numbers and web sites for the three credit bureaus:
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