Credit Assistance Network is one of the few credit repair providers that offers a pay-as-you-go pricing structure. You'll make an initial payment of $179 (or $279 for a couple), which gets you access to one -on-one consultations with a certified FICO professional, debt validation/goodwill letters to creditors, cease and desist letters to collection agencies, and unlimited disputes. From there, you'll be charged for every deletion CAN is able to achieve on your account - $50 for confirmed deletions per bureau, and $70 for deletions from public records. That could add up very quickly, if you have multiple issues on your credit history.
If you find information that is incorrect, you can file a dispute. Remember too, that items on your credit report that you don't recognize could also be potential signs of fraudulent activity — someone working to secure credit in your name for their own use. Make sure you're clear on items that could potentially be fraudulent, versus those that may simply be inaccurate.